A large number of 2nd temple Jews became followers of Jesus in the period between 33 AD and 132 AD.The fight-back against the Jesus-movement Judaism was the rabbinical Judaism, a new creation from Pharisee JudaismRemember that the "Christians" didn't exist as distinct from "Jews" until after 70 AD (and the destruction of the temple) and that was cemented after the 115-117 AD Kitos War (the 2nd Jewish-Roman war).
The Jesus-movement was a sect of 2nd temple Judaism alongside the Pharisees, Saduccees, Zealots and Essenes
After the destruction of the temple (as prophesied by Jesus in the Olivet discourse, as seen by Daniel in his visions (which completed his visions) and as seen by John - the temple was destroyed to the ground, the stones were torn up), the Saducees disappeared
The Jesus-movement said "Hey, look! Jesus said He would come back in judgement and He did/ He said the temple would be destroyed, and it was. Come, join the continuation of Judaism, the fulfilment of Judaism -- the Jesus movement
But many "Jews" had "become" Christians before the foundation of modern-day Judaism in 70 AD/80 AD
As Paul wrote in the book of the Galatians -->
- 7 Understand, then, that those who have faith are children of Abraham.
- 14 He redeemed us in order that the blessing given to Abraham might come to the Gentiles through Christ Jesus, so that by faith we might receive the promise of the Spirit.
- 16 The promises were spoken to Abraham and to his seed. Scripture does not say “and to seeds,” meaning many people, but “and to your seed,”[i] meaning one person, who is Christ.
29 If you belong to Christ, then you are Abraham’s seed, and heirs according to the promise.