Offerings by the Book
The New Testament says the faithful should set aside a portion of their income as an offering, not a tithe:
"On every Lord’s Day each of you should put aside something from what you have earned during the week, and use it for this offering. The amount depends on how much the Lord has helped you earn. Don’t wait until I get there and then try to collect it all at once."
Pretty straight-forward. So how does is work today?