Based on Paul’s teaching about those observing the Law being under a curse (Galatians 3:10-14), does this mean that churches and believers who believe they must follow the law of tithing are under a curse?
Paul’s basic teaching throughout Galatians is that Gentile believers who wished to submit to the Law through circumcision were, in turn, obligated to keep the entire Law (613 commandments). By so doing, they placed themselves under a curse — the disciplines of God detailed in several Torah passages (Leviticus 26; Deuteronomy 28-29; etc.) — as they would find it impossible to keep the whole Law.
I would not say that modern-day “Law-keepers” are necessarily under a curse, but the fact remains that it would be impossible to keep the tithe exactly as Moses commanded: a largely agricultural, annual rate of 23 percent. Though they would not necessarily suffer any special judgment from God, I do believe they rob themselves of His blessings that come through the teaching of grace-giving.