The old testament tithe was never revoked by Christ and is the basis for the Protestant, Mormon, and other Christian faiths belief in it. My Jewish friends tell me that the more conservative or Orthodox sections of their faith also believe in a tithe.
By definition, a tithe is 1/10 of your increase, and in fact tithe comes from the Old English word for the ordinal number we now call Ten.
Some Christian theorists believe that the tithe, as part of the Law of Moses, was revoked thru Christ. However, just as many will say that there is no direction in the New Testament to that effect, and that Christ himself mentions the Tithe in his rebuke of the Pharisees. (Matthew 23)
"The Church", so to speak, does not act as anything but a conduit for using the tithing funds to promote the work of God. Some Christian churches have decided that that means using it to pay the Minister, Pastor, or Priest, while others believe that those funds are sacred and reserved for caring for the ill, poor, and spreading of the Gospel and that funds to pay the Church leaders should come from a different source.
Of the common American denominations, I know that SOME Baptists, Lutheran, Church of God, Mennonites, Wesleyans, request a tithing.Interestingly, many of these state it is a requirement, but that their is no way to enforce it.
I know that Mormons believe it is an important part of their faith, and is required.
There are others, and if I remember I'll post those later.
Bill