Final answer:
Christianity was the religion that helped Christians in their prayers and worship. The Catholic and Orthodox Churches were the dominant branches of Christianity.
Step-by-step explanation:
The religion that helped Christians in their prayers and worship was Christianity itself. Christians practiced various customs such as prayer, meetings in house churches, communal feasting, and baptism. The two dominant early branches of Christianity were the Catholic and Orthodox Churches, and they played a significant role in guiding Christians in their religious practices.