One of the tendencies existing in early Christianity, which was difficult to resist, was syncretism. It manifested itself in the desire to inscribe the new faith into the general cultural context of the epoch. Thanks to this, Christianity had a chance for dissemination, because people absorbed new ideas much easier when they were shown the connection with those they had been professing so far.
The evangelists were well aware of this, for example, Saint Matthew addressed his Gospel to people brought up in the spirit of Judaism.