I read a part of the bible the other day where it said basically not to show off, don't tell the whole world that you gave to charity and things like that, it's a sin.
Mormons do tithing and its a well known 10% with a 8 times return (somewhere in your life)
I know mormons who couldnt afford this and were asked to tith less...on a contract.
Ive also know Samoan churches who require a base amount for donations...if you give blessings are bestowed if you cant ...they will pray for you.
Religion is a money making business...the book means little these days.