“God said so” because it’s a good thing - just like everything else God has commanded. Although the Law of Moses has been made obsolete by the gospel, medical science has confirmed many of its instructions to be beneficial. (Surprise, surprise!) Circumcision is one of them.
As to the “brutal attack with a sharp knife on a defenseless infant”: That’s rather silly. What if the child needed a different surgical operation? Parents who love their child will do what is best for him, even when it’s painful.
A Jew is obligated to circumcise from Genesis 17:10 Exodus 4:24-26 is before the law and the covenant at Sinai.
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You make Yeshua into a liar with that ridiculous statement.
Matthew 5:
[17] Think not that I am come to destroy the law, or the prophets: I am not come to destroy, but to fulfil.
[18] For verily I say unto you, Till heaven and earth pass, one jot or one tittle shall in no wise pass from the law, till all be fulfilled.
[19] Whosoever therefore shall break one of these least commandments, and shall teach men so, he shall be called the least in the kingdom of heaven: but whosoever shall do and teach them, the same shall be called great in the kingdom of heaven.
Incase you haven't noticed, Heaven and Earth have not yet passed away, nor has anything but Passover and Pentecost been fulfilled.
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At what point in time did the Law of Moses become obsolete? When did G-d’s ETERNAL word become null and void?
G-d’s Word as found in Torah are PERFECT and ETERNAL and are NEVER to be changed.
What part of PERFECT, ETERNAL and NEVER TO BE CHANGED are not understood?