This post explains so well where I think you are misunderstanding God.
Scripture says it is the spiritual meaning of circumcision that counts, not the physical. I agree, it is circumcision of the heart that counts, physical is not required. You are taking this to extremes, we are human in a physical body and if we do something that leads us to spiritual understanding, it is not wrong to do that. It is only absolutely necessary we understand it wasn't the physical action that counted.
You are making a big case for "no Jews". God doesn't do that, and does not lead you to do that. It is wrong. Christ came for the Jews and the gentiles. God had pointed out all along that what they did physically should relate to the spiritual. Read the book of Isaiah, that is what it is about in large part. Your extremist view of "no physical" is not Godly. God says that we are not to use the physical as salvation, that part is Godly.
You need to study the development of the early church that developed from Jews and Gentiles who worshipped in the same synagogue to Constantine who ruled so anything of the OT was illegal. Constantine ruled for a new God, divorced completely from the root of Christ, from the OT teachings. Constantine taught that nothing of God preparing for Christ related to Christ, Christ was a new God who cancelled out the old, obsolete God. Constantine wasn't even a Christian, just used Christianity to unite his nation, and became Christian on his death bed. Before, he even murdered his wife. You are following Constantine, not Christ.
God blessed the Sabbath and made it a holy day. We are allowed to celebrate as Constantine led, he made it into a Christian celebration. But it is impossible to cancel what God has created by blessing the Sabbath and making it a Holy Day. Gentiles always worshipped on Sunday, it honored the sun. It honored idols. God said we could use that day to worship, it was if our hearts worshipped the true God. However, your decision to take away the Holiness of the Sabbath, and saying God only made it holy for Jews and we were excluded if wrong.