Depends which particular Jews you're talking about! Before the destruction of the Temple there was an enormously wide spectrum. At one end, the author of the 'Damascus Covenant' rejected Jews who weren't in
his particular group, and they weren't supposed to mix with them, beyond, I suppose, the necessary minimum. So he certainly wouldn't have
had any truck with
Gentiles. At the other end of the
scale, the early Rabbis, and probably their Pharisee forerunners, would accept
Gentiles as long as they kept a few basic commandments, which were believed to have been given to Noah, and through him, toall humanity. The Law of Moses wasn't required, as it was given specifically to Jews. A very similar ruling is found in Acts, so the Jerusalem
church probably took a similar line. Paul quarrelled with them because he wanted to accept them as full
members of the community, not as tolerated aliens. People like Izates and
Helena seem to have undergone a full conversion, and become Jews, keeping the Mosaic Law in full. Only the extremists would have
had a problem with that.