The point is that it doesn't matter.
Whether a faith has direct lineage to some ancient orthodoxy or is a modern cobbling of beliefs like Mormonism, ALL have just as much proof as any other. All deserve just as much respect and tolerance.
Being unable to prove my opinion that if God is, He's way bigger than ALL the ancient stories, let alone any one of them, I have no right to tell anyone that their faith is wrong. And I deserve the same respect.
EVERYONE has the same right to be wrong in religious matters.
I think we're talking about two different things. You're talking about how any religion can say anything it likes. Which is true.
I'm saying how when you take two religions (however true or not) and compare their core beliefs, yet one's including another discrete faith with its' own despite it being mutually exclusive, that's an error of theology.
To put it another way, 1+1=2; 2+2=4 (any/all/every religion being numbers); but a+1 does not equal 2 or 4. A number plus a letter makes no sense.
At the end of the day Brother, all you have is your opinion of the core beliefs of religion A and your opinion of the core beliefs of religion B.
Your opinion of claims. Your beliefs.
The good news is that you have 100% control of yours
The bad news is that you sir, are just another swinging dick taking a ride on this living Timeline, and EVERY swinging dick and EVERY sheath-for-sword has the same right to be wrong.
If there was proof, it would be science, not religion.