I do not believe "all" religious people are greedy. That is a hasty generalization. I do not believe all religious people who are rich did it via manipulative means. But anyone who gains their wealth through donations in their congregation for "tithe" which is supposed to go to the poor, widow, and orphan, I have a problem with.
In all honesty, I kind of feel bad for people that are ignorant enough to continue to give hard earned money to prosperity preachers. I could understand giving if it was a preacher who was poor and homeless or didn't preach for money. I'd be more inclined to be generous to a preacher who isn't doing it FOR money!
This Bible verse is straight to the point, Matthew 7:15 Beware of false prophets which come to you in sheep's clothing, but inwardly they are ravening wolves.