I'm saying I don't think we will ever have the knowledge nor the capabilities to know for sure.

I believe in my Gods because it makes my life happier, makes it easier to get up in the morning. If there really is some sort of spiritual realm all these great Gods reside in, we have yet to gain any sort of access to it that would provide us any proof, or at least not while we're alive. If Jesus really did walk the earth, it would have been far too early in time to have any remnant of it now.

My point is that we'll never know for sure. All we can do is choose to believe what makes life worth living for us as individuals.