Who founded (started) the Christian religion?

Answer:

Jesus and his Apostles

Is Christianity a Monotheistic (one god) or a
Polytheistic (many gods) religion?

Answer: would it be Polytheistic since they
believe in God, Jesus being his son, and the Holy Spirit.

1 answer

Christianity is considered a monotheistic religion.

Here are a couple of explanations.

http://www.godcontention.org/compare-religions/how-is-the-trinity-monotheistic

http://carm.org/does-the-trinity-really-teach-there-are-three-gods