Also Satan Didn't flood the Earth, Kill all Egyptian first borns etc.

Not necessarily true. There are some angsty teens who do that for attention or whatever but those are few and far between in the satanist scene. Theisic satanists mainly believe in a deity known as Satan of course however it is independent from the Christian religion entirely. They do not worship the Satan or devil from the bible. Satan biblically speaking was derrived from (most likely) the pagan egyptian god Horus. And made out to be the boogyman for Christians to blame the evil on. The whole good vs evil black and white concept is very new and uncreative and unrealistic.

Satan in the "real" sense is a god of knowledge. Satan in sanscrit (the written language from which the word originates) means truth. In Hebrew it means enemy, yet it was a word added to the language AFTER the bible was written. Coincidence? I think not.

Their beliefs are that Satan created the universe but it has no story to back it up as it has only one very short "holy" book of Satan the Al Jilwah. Satan created this world and us as his prize creation and instead if punishing us for being unfit and unruly, they believe he wants humanity to advance intelectually and physically to be the best that we can be and live life to the fullest. There are some rules to follow like don't steal, dont enter another's domain without permission, Ect. But they're all perfectly reasonable and fit for a modern day moral code.

They believe Satan does not need nor wish to be worshiped. They believe in an afterlife in which they reach by recognizing that Satan is the true god and by advancing mentally through meditation and magical practice. If they do not do this (I.e don't follow the religion) they are not punished at ALL. They simply begin a new life to try again.

It preaches self reliance, togetherness, intellectual advancement, peace, wiseness, and enjoyment of this life.

All in all, not a bad religion at ALL. I would know, I practiced for a time. I soon realized I had no reason to believe in Satan just as I don't for god and became atheistic satanist. Meaning I follow the rules as moral code for myself and practice meditations for mental and physical health. Its very nice :). And I take comfort in knowing that there's no price to pay by leaving IF he should exist. I don't know why but i do.

Hell, sometimes I even draw a pentagram on my chest with my finger for luck or strength. Call it a superstitious luck charm but hey, it works :)

Now there's also Laveyan satanists who are part of the cult started by Anton Szandor LaVey. He basically preached to indulge in the 7 deadly sins through his book the satanic bible. It's not too bad but I don't agree entirely with it. They don't believe in Satan directy either.

That's about it if you have any questions feel free to ask :)

Actually it is probably more because god has killed millions of people and satan has not.