You have given me a purely biblical explanation – there are without doubt inconsistencies in biblical stories and a reasoned argument cannot rely on just one source. If you have other texts that back up your comments that would be great (I was brought up a Christian so I’m fairly clear on the Bible’s version of events).

After Jesus’ death his actual disciples stayed on in Jerusalam, for many years there was a Christian church in Jerusalem, they were Jewish in their practices yet had a belief in the risen Jesus. Jesus’ own brother, James, was the head of this church.
The 4 gospels and the letters written by Paul tell little of that, original, church. Why? Most likely because Paul was trying to produce an acceptable religion for non-Jews. A religion that would not require adult male converts to be circumcised, would not require the eating of Kosher food etc. Also Paul wasn’t daft. He wanted to make sure that the church wasn’t seen as the trouble causers by the Romans and to do that.. the easiest way was to paint to Jews as the bad guys and the Romans as just a bit mistaken.
Here’s a question for argument,
“should I, as a Christian, be following Jewish law if I want to practice a Christianity that is as Christ wanted, and not as Paul wanted?”