Judaism is the eternal guide for salvation. Moses, the prophets, Jesus, and the Apostles did not change it
But it is easier for heaven and earth to pass away, than for one tittle of the law to fall. Luke 16:17 ASV
Revelation 2:9 ASV
(9) I know thy tribulation, and thy poverty (but thou art rich), and the blasphemy of them that say they are Jews, and they are not, but are a synagogue of Satan.
Romans 2:13 ASV
(13) for not the hearers of the law are just before God, but the doers of the law shall be justified:
Luke 16:17 ASV
(17) But it is easier for heaven and earth to pass away, than for one tittle of the law to fall.
Judaism became 'the Way' sect with the incarnation of Jehovah
Judaism is the eternal religion that saves (John 5:39, Galatians 2:14). However, Christianity in general rejects Judaism in part as the basis of the salvation of Jesus. Christianity is branded with Sunday, the first day of the way while Judaism has been branded with Saturday for ever. Christians do not follow 100% Judaism.
In the unbelieving Jewish circle, Jesus has been rejected as the religious Masiyah who became flesh only to deliver from sins and not from calamities or tribulations of the chosen people.
But, Jesus came to fulfill our salvation, both the chosen people and the world. As a result of the transition of redemption from the symbolic blood of the animals to the real blood of God, there was an apparent split in Judaism: those who still would want to keep the recurring annual rites of atonement and those who choose only the once-for-all atoning blood of God.
The split gave rise to the sect of the first believers known as THE WAY, as exposed in the citations of the New Testament. What is the core believe of THE WAY? Still Judaism, as Apostle Paul confesses in Acts 24:24.
THE WAY just does not do the rites anymore because they were fulfilled, as many might understand from the reading of Colossians 2:16-17, a passage that is so much misunderstood and twisted to pitch Apostle Paul against Moses and the Prophets, while ignoring his confession of faith in Acts 24:14.
Acts 24:13-14 ASV
(13) Neither can they prove to thee the things whereof they now accuse me.
(14) But this I confess unto thee, that after the Way which they call a sect, so serve I the God of our fathers, believing all things which are according to the law, and which are written in the prophets;