here’s a very strange movement in some Christian circles called “The Prosperity Gospel” that posits some kind of supernatural investment scheme where the more money you give to god (read: churches and/or pastors) the more material wealth god will give to you. While most Christian denominations denounce this theology as false or even blasphemous most of them also have their own, more subtle versions of the prosperity gospel whether they know it or not.
The churches in which I grew up always passed the offering plate/basket around during services expecting members to give at least 10% of whatever they had. This is standard practice for Protestant churches under a doctrine of tithing. Some churches go as far as asking (“asking” is a funny word since the whole thing is done with an air of, “if you don’t, god will know”) the congregation to make pledges as to how much they’ll give for the year. This helps the church make a budget but it also very clearly shows the churches are just businesses.