Atheists do NOT believe in a deity, nor do they believe in Satan. If they were practicing Satanism then they by default would NOT be Atheists. It's seriously that easy. Where as Paganism has many branches in belief, and yes is an umbrella for Occultism which does branch to Satanism, one could argue (still incorrectly) that Pagans practicing Laveyan Satanism are killing young girls....none of which we have evidence of, nor has it been provided by the OP. We can NOT argue that Atheists are.

Atheists practicing Laveyan Satanism are killing young girls.

The title is an contradiction.

There are bad people in this world and some bad cults. I'm an atheist and, if I can't believe in "GOD or ALLAH, I can't believe in some "creation of a god", so, I don't know who the guys doing this are, IF they are, but I KNOW they are not atheists.

Are they friends of yours? You seem to know more about them than anyone else. :-)

LaVeyan Satanism is the wrong kind of Paganism. It is actually Atheism on steroids.

I am a Pagan who believes that Satan is very close to the real God but believe me on this; not only is Satan's real name Satana in the original storyline, but the female being that God is, is not a supporter of being as evil as you want, instead she wants (like Satan) to mercilessly torture the evil and corrupt for eternity if she could but then again has the cool-headed approach of Satan in that she'd rather just toy with them and tame them and make them become good instead. I tell you this; Jesus was Lucifer, Lucifer never began Satan... Allah was also Lucifer... Lucifer is the actual devil, Satan is God of OT.

I tell this truth and I let you know LaVeyan Satanism is a fucking disgusting joke. They don't worship Satan, they think Satan is an imaginary piece of shit who has no value.