Dream Theater is to music as Jesus Christ is to religion.
Thousands of years from now... people will still be listening to DT. Fact.
No where in ANY of the Gospels did Jesus EVER say "I am here to start a religion..."
Hey, I don't think DT ever planned to become a religion either right? So when they're getting worshiped 1000 years from now they might have more similarities to Jesus than you think. I mean by that point it will have been fully established that JP was obviously the second coming in disguise.