I can't think of supporting any other football club than Manchester United. I'm too lazy to do that and I will contradict myself.
I'm very surprised to see people who say They will stop supporting United if the Saudi take over. Yes, They(The Saudi) do have morality issues in their country but We are currently owned by businessmen with money as their main interest. Do you know how business work? it's not much better, it can be very dirty and immoral as well.
Clubs like United are too huge to have their cultures affected by their ownership. Outside of money related stuffs I doubt it will have a huge impact, the fan base and the history is too big to be changed. United will remain United, the huge football organization. Ideally I would want filthy rich ManUtd supporters to purchase the club, but it's not realistic. If the Saudis takes over, We're not going to suddenly become the club who supports murders or hates LGBT. We're not a corporation, football club has it soul within it's fanbase, players, manager and history.
We've been owned by the Glazers for how many years now? We've never talked about how They brought American cultures into the club, have We? They're here for their own interest (money and business). The Saudi (if They take over) will have their own interest too, which is to diversify their wealth (money and business again) - not to change the club to support their political views. There are much better, less expensive tools for that.