Riddle me this, Batman: why would you think that tithing, which was never commanded prior to Moses, still be required of Christians, but circumcision, which was commanded prior to Moses, not be required of Christians? Further, if it is so important, why was tithing not mentioned in Acts 15?
39 They answered and said unto him, Abraham is our father. Jesus saith unto them, If ye were Abraham's children, ye would do the works of Abraham.
Matthew 23:23 King James Version (KJV)
23 Woe unto you, scribes and Pharisees, hypocrites! for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone.
Circumcision of the Flesh and Tithing are requirements for Followers of Messiah/Christ, as instructed by Yeshua Messiah/Jesus Christ. We must do the works of Abraham and Abraham circumcised himself, his sons and his household. Abraham Tithed.
Prevalence of circumcision
"The prevalence of circumcision is the percentage of males in a given population who have been circumcised. The rates vary widely by country, from virtually 0% in Honduras and Japan, to 20.7% in the United Kingdom, to 7% in Spain, to 45% in South Africa, to 75% in the United States, to over 90% in Israel and many Muslim-majority countries. In 2010, the World Health Organization (WHO) estimated 30% of adult males worldwide (aged 15+) are circumcised, with about two-thirds of those being Muslims...."
During the 2000s, the prevalence of circumcision in men aged 14–59 differed by race: 91 percent of white men, 76 percent of black men, and 44 percent of Hispanic men were circumcised, according to data in Mayo Clinic Proceedings....."