1. Individual awards aren't really relevant in team sports, specially since 2009 when the criteria to choose the most popular ones changed significantly. But you already mentioned Messi, and then there's Pelé and Maradona, all of whom were also awarded as the best players of a WC.
Of course its relevant, We are comparing GOAT, not greatest team of all time, individually you don't get anything better than Ballon D'ors. Ronaldo has won 5 of them, and finish runners up 6 times. Only Messi is comparable.
You may argue its not fair to the past greats who weren't eligible as many of them aren't Europeans, but in fact Ballon has published a revaluation of their awards before 1995 to include players of all nations. Pele would have won it 7 times, Maradona would have won it twice, Garricha, Kempes and Romario would have won it once, But even so, Ronaldo would still be easily among top 3 greatest ever, and far ahead of others.
2. First of all, it's not an all time record. Second of all, career goals aren't a good way to compare eras, since the amounts of official matches played, the relevance of them and the strength of the opposition tend to vary. That's why we don't include Helmchen, Bican, Puskas and Deak in the GOAT debate even when they have more career goals than Cristiano Ronaldo. But if you want to compare it to Pelé, he has like 15 goals less while also having played 252 games less, therefore having a goal-to-match ratio overwhelmingly superior to CR7. As a matter of fact, almost everyone in the top 15 has a better ratio than him.
In the top level football, it is. Sure if you include those from WWII period where majority of young men are at war (ie Bican), or those from low level regional league (Helmchen), there are a few from 30s-50s who were better. But those are irrelevant records as their level of football are far much lower (counting many goals against pub players in low level/amateur football). In other words, in terms of professional football at top level, Ronaldo is officially all time best.
3. UCL winning record just isn't true, since Paco Gento have won it 6 times (and you don't see his name in the GOAT discussions, which is a takeaway in itself). Maybe you were referring to the record since the UCL has that name, in which case isn't an all-time record but a "since the mid 90s" kind of record, which makes it incomparable with most of the other all-time greats and therefore irrelevant for the discussion.
Ronaldo won CL 5 times as best player of competition. Gento won it 6 times, but did he win it all as best player too? I don't think so. Best player from Real Madrid team at that time were Di Stefano and Puskas, Gento was a great player, but he wasn't 6 times best player when Real Madrid won it 6 times.
4. Euro AND Nations League won, which is astounding for Portugal. Altough, in the biggest tournaments for that matter the best performance for Portugal is still the 3rd place of Eusebio's 1966 team. As a matter of fact, Cristiano in 4 WC hasn't been able to match Eusebio's goalscoring record in just one. And, considering only the Continental Cup feat, guys like Romario, Ronaldo, Batistuta, Francescoli, Xavi or Iniesta have similar or more impressive feats. Hell, Alexis Sánchez won 2 (one even as the Best Player of the tournaments).
It doesn't matter. Ronaldo historically won it as captain of the team, and Portugal's most impactful player throughout the tournament (3 goals 3 assists). That's all it matter. Eusebio was a great player, but he didn't win a single trophy for Portugal. People celebrate for winning a major international trophy, but not as 3rd place finish. You are just being too obsessive with WC, and ignored everything else.
5. Overall trophies won isn't a good measure and I shouldn't need to explain why. First of all, the number of tournaments has multiplied since the 90s. Second of all, the vast majority of these tournaments aren't relevant in a GOAT discussion (a WC is not the same as winning the Scottish League, for that matter). And third, there's a reason why Glasgow Rangers is not considered one of the greatest clubs of all time.
This alone isn't a good measure, but It surely does indicate how successful he is throughout his respectful career.
But lets look at its context, Glasgow Rangers didn't manage to win 1 CL in their trophy cabinet, let alone 5. Sure they won all their domestic titles and cups, but Scottish league wasn't even top 5 league in Europe. Ronaldo won it all in top 1-3 league throughout his career, which is far more impressive.
6. The number of international goals is impressive until you consider the factors of number of games played and the relevance of those particular goals. When we discount friendlies CR7's number go down to 85 in 124 matches. When we substract the goals in qualifying stages (where the opposition is significantly weaker, particularly in UEFA's qualifying system) he gets 22 goals in 46 matches played. The same exercise leaves Pelé with 20 in 20, Ronaldo with 34 in 42, Romario with 26 in 32, Batistuta with 27 in 33, Muller with 18 in 15, and so on.
If we discount friendliness he was still the all time best. But sure you can argue if only counts goals scored in major tournament, he wasn't the best ever. But then, lets be fair, Portugal wasn't as strong as Brazil, Argentina, Germany during their prime too. You just don't expect a team like Portugal would have a goalscorer to outscored teams like Brazil, Argentina, Germany during their prime years in all major tournaments. It isn't realistic at all.
7. UCL records are relevant if you're willing to ignore that in the past century not everyone played it, there were a lot of less games played, the overall relevance it had was smaller, and therefore most of the GOAT candidates didn't play it that much (or at all). The few that did (Di Stefano, Beckenbauer, Cruyff, Müller) also have impressive numbers considering the scale of the tournament at the time.
Of course its relevant. Di Stefano was widely regarded as GOAT half century ago because of his UCL records. If it was relevant half century ago, why it isn't relevant today, when the competition is more important than ever? Ronaldo won it 5 times, scored most and assist most, in the era when the competition is widely considered as the most prestigious and highest level of football, this is simply an undisputed best possible accomplishment in modern era.
Also, If you are better player than Pele and Messi, but you are from Welsh, what can you do? You can't choose your nation, but you can choose your club, and this is the kind of career/accomplishment every top players in the world would be dreaming and fighting for. If your favourite player has achieved this feat, you would be singing your praise all day too. So, don't let your own agenda getting ahead abit too far.
8. Finally, the list of players. This has to include players that have reached major success in NT, clubs, and have reached legend status in the WC (that has been the most important football competition for almost 100 years and counting). The hall of fame here is short:
-Pelé
-Beckenbauer
-Maradona
-Cruyff (debatable)
The ones who come next would need at least 2 of the previously mentioned conditions, hopefully WC legend status being one of them:
-Di Stefano
-Ronaldo
-Müller
-Zidane
-Garrincha
-Puskas
-Eusebio
-Meazza
-Matthaus
-Romario
-C. Ronaldo
-Messi (debatable)
I hope this helps.
In terms of WC, yes, there were better legends than Ronaldo and Messi. But, if you think its not fair to compare UCL as not everyone has similar chances, why is it fair to compare WC only when there are players who are playing for far stronger nations, while there are also players playing for far weaker nations with far less chance of winning or progressing?
If Pele, Beckenbauer or Cruyff were playing for Portugal or Argentina in 2010s, do you really think they will remembered as WC greatest ever?
But if you are being fair, willing to see step ahead from your very limited eyesight on the WC, which is essentially only a few games for each players in every 4 years with strong nations dominate, then perhaps you will be willing see the whole picture, and start comparing everything from their whole career, then of course Ronaldo and Messi should both be regarded as top 2 or 3 greatest ever.
Let's not forget the likes of Hector Rial and Santamaria too.