As regards the OP,
To answer the small question first: No significant organized Christian body, including the Catholic Church, condemns masturbation. If Sister Rosemary told you it’d make you go blind or whatever, take it up with her and stop blaming the rest of us.
As to the rest, y’know, I don’t believe in UFOs, but if a million people from all walks of life, from many cultures, from different times and cultures, amny of whom were otherwise reliable witnesses, all started reporting the same thing, I might at least rethink.
For the last two thousand years, a billion people have reported having a real and dynamic encounter with the person of Jesus Christ. I’m not talking about people who sort of nominally believed and went to church. I’m talking about people writing and talking passionately about how their lives were changed by God. Illiterate backwoods folk, yes, but also people like Newton, Pascal, TS Eliot, Bach, Kierkegaard, Woodrow Wilson, Dostoyevsky and on and on.
I have no problem saying that there are plenty of intelligent people who are Athiests. (or Muslim or whatever). Why do so many people insist on saying that all Christians are gullible boobs, when it is empirically verifiable that they aren’t?
I was just reading this the other day: " It must be fixed in one’s memory as the highest rule, that what has been revealed by God is to be believed as the most certain of all things…we must give credence to the divine authority only, rather than to our own judgement." Descartes said that, and I don’t think he can credibly be labeled as gullible.
As to whether Christians would be so if they weren’t raised that way, you might want to ask where Christianity is growing nowadays? Not in the US, but in places like Africa and Asia, where people are converting from other or no religion. Or China. The church operates illegally, under sometimes violent persecution, and with minimal contact with Christians in the West. And yet it’s grown by several orders of magnitude in the last few decades. I suppose they willingly face death because they think it’d be fun, and they only converted away from the beliefs their ancestors have held for centuries, because, as we all know, Asians have so little respect for tradition.
Look, people much smarter than you or I have been wrestling with the questions of God and the meaning of life forever, and different people come up with different answers. If you want to really investigate a religion or worldview or philosophy and decide against it, that’s one thing. But when you make these condescending pronouncements about how they must all be dumb to “fall for this crap,” you only make yourself look asinine; every bit as asinine as I would if I went up to Carl Sagan and told him he was dumb because he didn’t think the way I did.