Please convince me that this whole DNA thing is not BS

[rotenym]

I am basically looking for cousins, but i am still stuck at the point of trusting the whole DNA thing, or at least in my case believing that there are no errors here... i will try to describe, i am Jewish and we have something called "Cohen, Levy, Israel" which means that all Jews are divided...

[rotenym]

Maybe Family tree made an error or mixed something up... i spoke to them, they told me that they wont do retesting..

[rotenym]

I did the Y-111 and the Family Finder test, i uploaded it all to GEDmatch, i got more then 21k matches with 1 that is even shard-cm of 284 and the longest block being 52 and not even 1 match makes sense... Please don't come with all kind of silly excuses like intermarriage and adoption or mixed up in...