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Bear with me, I don't have an extensive foundation of Christian or Judaic teaching.
Oftentimes Christians will cite the Old Testament as evidence that a particular thing is bad, such as homosexuality. (I understand that such people may not be official representatives of Christianity, such as a clergyperson). The a critic will point out that the Old Testament forbids things such as tattoos, garments of mixed fabric, and tattoos. It's not clear to an outsider what in the Bible the Christian must be held account to.
One thing that is clear: the admonition against unclean foods is abrogated in Mark 7:14-19, and later confirmed in Acts 10:10-15 and 1 Corinthians 10:25-27. I'm not aware of other versus where other Mosaic laws are 'repealed'.
I know that many, if not all, churches uphold the Ten Commandments, but none of them, as far as I know, require circumcision, keeping plants of separate kinds in separate fields, etc. So what, out of the Old Testament, are Christians held responsible for, and what is the basis for what is kept and what is left? Was there a blanket repealing of the Mosaic law, aside from the Ten Commandments?