Can Christianity be considered a ponzi scheme?

Answer 1

Not by anyone with any sense, no. Even if you don't believe or agree with the premise, it's clearly not a Ponzi scheme. Some flavors of the "prosperity gospel" might sort of graze the edges of being a Ponzi scheme, but a) they aren't quite the same thing and b) most Christians repudiate those also.

There is a passage in The Bible where it says basically "stop cheating God; bring in your whole tithe and just seeif God doesn't return it manyfold."

We can't lay the blame for this on "Christianity", though, since the passage is in Malachi ... about 400 years before Christianity even existed.