It is the religion of those that believe Jesus Christ is the prophesied Messiah. It is founded upon the new Covenant not the old Covenant which contains different rules and commandments.
Then is Christianity a new religion with a new God? Was it a different God who wrote the old testament?
I thought the rules between the old and new covenant were the same as it tells us in Jeremiah. It says the law was now given in our hearts, but I have not read the "rules" were different, only the method of delivery was different.
Christ said we have been told, and Christ said he did not change what we have been told. Then Christ told us the difference between being told in stone by rules and being told the same thing to our hearts and minds. I didn't think scripture tells us of a new God and a new religion. Scripture says Christ completed it, he fulfilled what was of the old, and what is new is a change from the fleshly stone delivery to the delivery to the heart of the same rules. Scripture says God is eternal, meaning it is the same God from Genesis to Revelation, not a new God.
Scripture says the new covenant was to improve the old covenant, I haven't read that God was all wrong and completely mistaken when he gave the old one. The old one became obsolete, old, and went away because the new one was so much better.