If your parents had belonged to a different religion, do you think you would belong to that religion too? I don't really know, but I do believe that I'm a very religious person and I would most likely be directed towards one of the Abrahamic Religions.
Why are Churches filled with riches when Jesus asked his followers to give their wealth away? What do you mean they are filled with riches? They have money yes, just because you see some protestant church on TV flying around in personal jets, this does not represent most churches. May be wrong, but Jesus asked his followers as the Apostles to drop everything they in order for him to do what he needed to do, he didn't ask everyone to just drop their shit and forget about it.
Can a mass murderer go to heaven for accepting your religion, while a kind doctor goes to hell for not? My religion believes even if you do not recognize yourself as a Catholic, you can still go to heaven
Did the mass murdering Crusaders and Inquisitors make it into heaven? Idk, I do not decide who goes to heaven or hell, all that we know is what is bad and wrong and what leads us away from God practically.
Why does religion appeal more to poor, weak, vulnerable, young, ill, depressed, and ostracized people? It's easy to look for hope and faith when there is nothing else in site, it's hard when there is much blocking hope and faith, while temptations and obsessions can be in your way