. . is not so much an offshoot of Judaism as it is a sub-cult of the Pagans (var. cult of the dying god). It's a pastiche of what was going on at the time: the cult of Isis and Osiris, the Krishna cult, possibly Buddhism and most particularly Mithraism (the mystery religion of the Roman Legions). Much of the Judaism (adoption of the Old Testament, etc.) is sort of added on later to support the authority of the church.

There is no reason whatever for a Christian to follow Jewish dietary law. In any case, much of that appears to have been concocted to make Jews "different" to keep them from fading into the populations of city folks.

The error of Christianity is not its content but to proclaim itself the whole story and deny all else when it is actually just a sub-cult.