You say the religion of Abraham is 4000 plus years old?
But this is a mere drop in the bucket of time since human beings began walking upright and looking toward "heaven".
Many, many religions have come and gone in the intervening time. New Gods and their respective heavenly hosts have evolved and then subsequently desolved..... All the while believers of many of these "theologies" have busied themselves killing non-believers for one reason or another....Most all of these were absolutely sure theirs was the "one and only"and that they were special.
But....This this subject (Divine existence)...is, as you infer, difficult to prove...either way....and even for those cults that are no longer in vogue.....for who knows and who can prove using reason and logic and avoiding emotion?
Nonetheless, no offense meant...and have a nice day.