Well young man i believe our belief is true because our saviour rose from the dead and appeared to many many people.
In the last 25 years, Elvis has appeared to many people too. What does that make him?
And incidentally, we only have the word of the evangelists that many people have seen Jesus. Unlike Elvis sightings, no firsthand records exist of it.
For God is not the author of confusion, but of peace. 1 Cor.14:33