First off, let's address the question- What if? The religious community is wrong about the return of Christ. Maybe it is someone else?
The first part- the 'religious' community being wrong. I would say, yes- they are wrong. It isn't a matter of them lying, but deceitiful actions. Jesus Christ died not for the reasons believed, but because 'religion' leaders who lived during his time didn't want his message passed a long to others. His message was encoded in his teachings, so as to not get himself in trouble. After Jesus Christ was executed, the so-called 'religious/spiritual' leaders stole his teachings to keep his followers in line.
This control over the masses has gone on for centuries. Jesus Christ is dead and will not be making an form of reappearance before the people, ever again. Nor will anyone else from religious scripture.
The 'bible' is a history and mythology book, which shows us what we are not to do as a society and how to avoid our own destruction. Yes, it has basic morals for life, but that's really all it is good for.