Hello there!
1) Christianity
In this group, there are protestant, Jehovah Witnesses, Catholic and more. Even though they are different religions and they do things differently, they are still considered as Christians.
2) Judaism
3) Islam
This religion started in the Middle East by a guy name Mohammed. People in the Islamic religion are called: Muslims
4) Buddhism
Hmm...People from India, Nepal, China and more, brought this religion with them when they come to America.
5) Hinduism
I hope this answer helps! As always, it is my pleasure to help students like you!