Jesus had twelve disciples that helped establish his teachings. Furthermore Jesus did not write about his revelations from God. Other people wrote what they saw about him. In the other religions of the world their leaders wrote their own stuff. That in itself makes Jesus more credible?
The Bible is believable if you are looking for truth. There are so many witnesses confirming the same thing. It is the only reliable book about how we are to live our lives. If we want to find true peace and happiness it can be found in none other than Jesus.
But above all, Christianity is about grace while other religions are about works.