Jesus started one true Christian religion.
The Bible teaches that only a few people are on the narrow road to life - Matthew 7:13,14.
The Bible foretold that after thedeath of the apostles, wrong teachings and unchristian practices would come into the Christian congregation. Men would draw away believers to follow them instead of Christ. (Matthew 7:15,21-23; Acts 20:29,30) That is why we see so many different religions that claim to be Christian.
How can we identify true Christians ?
The most outstanding mark of true Christians is that they have real love among themselves. (John 13:34,35)
Thea are not taught to think that they are better than people of other races or scin color. Neither are they taught to hate people from other countries. (Acts 10: 34,35) So they do not share in wars.
True Christians treat one another as brothers and sisters. - 1 John 4:20,21.