Well, you're building a HUGE assumption into your question:
You're assuming that we WILL find out that Jesus Christ is the only way.
And logically speaking, of course, your assumption may be wrong. That's what most atheists & agnostics are assuming.
However, IF your assumption is correct, and our assumption is wrong, and if we do actually discover that Jesus Christ is the only way, I would guess that many of us will change our minds.
Is that what you were really asking, however? Or is this just a rhetorical question, a question designed to hammer home a particular point of view?