Answer:
Because Jewish law forbade them from worshiping the Roman gods.
Step-by-step explanation:
The Hebrews regarded themselves as God's own chosen people. As such, they maintained a monotheistic system of worshipping the only one true God through various religious rituals prescribed in the Torah.
The laws given to the Hebrews by God forbade them from worshipping any other god. However, the Romans had a polytheistic system of worship. This is inconsistent with the tradition and laws of the the Hebrews hence they refused to adopt the Roman way of life.