[Clubber]

I've never seen anyone do 10% of their income, I think that comes from the medieval period, or just wishful thinking. People usually drop a $10 or $20 in the plate whenever I've been.

[ceejayoz]

It’s quite common in some evangelical denominations. Mormons do it as well.

Even when it’s not a formal tithe, American charity skews heavily towards giving to churches.