LOL! I didn't "villify any "religion". Simple stated a logical rule - two opposing doctrines can NOT be true at the same time.
Logically, one religion has no more proof to its rightness (or righteousness) than any other, so why should two people whose beliefs conflict fight?"
LOL again! I repeat, two opposing doctrines can NOT be true at the same time. Obviously, since you can't discern ... amongst other things ... the "conflict" is that one belief is true and the other is false. As for "proof" that can be accomplished as well. A reasonable person can come to a logical conclusion based on the evidence available. Wonder why you can't ... .
"Why should they be trying to convert or eliminate each other? Even if one religion spread to every person on earth, and the world was united, it would give no more veracity to its tenets."
Why not? Why not eliminate a false belief. At one time people believed the earth was square. Should that belief NOT be eliminated? Evidence indicate otherwise. According to you it would be better off to disregard the evidence of the falseness of the belief. LOL!
It's not about "veracity to its tenets". It's all about what is true and what is false.
A short course in logic would do wonders in cleaning up you thinking.