Tithing

In church there is much discussion of tithing (one-tenth part of something, paid as a contribution to a religious organization). Church leaders refer to the income I’ve worked for as my “treasure” and state I should “give my money to God”. I didn’t happen upon my earnings, it is not a treasure. I traded time and labor for my money. What is God going to do with this coin and paper? I can donate it to the needy myself.