The Law was a covenant between God and Israel and not God and the world. The Gentiles never were a part of this covenant, and that doesn't change after a person gets saved because Jesus was the end of the Law as a means to righteousness.
The Law was established so that the Jews could have a way to be righteous before God. If they kept the commandments of the Law then they were counted as righteous and received God's blessing. But if they broke this covenant by not keeping these commandments God (not the devil) cursed them. But, now, all people that are in Christ are righteous before God through Jesus and the Law has passed away because it's righteous requirements have been fulfilled in Christ.
So, if you want to give to your Church, then give. And, if you don't want to give then don't. You're righteous before God either way. If you want to give to a person then do it, if you want to give to a charity then do it. Just give from your heart and not because someone has told you that the Bible says you are required to give a tithe because that just isn't true.
exeric, good post about tithing. You made several valid points.
Blessings,
Alan