This is a list from my personal experience talking to Christians. I'm from the United States, so Christians are who I typically talk to. They make up anywhere from 75% of the population all the way to 95% depending on which country you're in. I have spoken to those of other faiths, but they haven't given me any reason to talk about religion outside of learning about theirs.
So, without further ado:
Atheists are Satan worshipers.
Atheism is a lack of belief in gods or gods. That means that we don't believe anything supernatural about any religion. That includes Satan, and any other mythical bad(?) guy from any other religion. We can't worship something we don't believe in.
Atheist hate God!
Need I say more?
Atheists have no morals.
No, we actually just try to be as good as we can be all by ourselves. We simply don't need the threat of being tortured for all of eternity in order to help old ladies across the street, give to charity, or help our siblings with their homework... It's really that simple. We grow up and learn to treat others the way we would like to be treated. No gods required.
Atheists can't prove god doesn't exist.
I'll just leave that there. Insert anything you want in there. Unicorns, Centaurs, Flying Spaghetti Monster, all the other religions of the world that you don't believe in... yeah, works for all of em.
What if you're wrong...
What if you're wrong? There's roughly 4,200 religions right now that we know of. Adherents of other religions believe in their gods just as sincerely and fervently as you believe in yours and most of them have mythology to back their god. How do you know you haven't been praying to the wrong god this whole time and you aren't just pissing off the real one?
Atheists never believed in god to begin with.
Yes, there are some atheists that never had a religious upbringing and never believed in any gods ever. But most atheists were raised in and believed in one religion or another. Most atheists in America were baptized, accepted Jesus, believed in the resurrection, and genuinely believed in the doctrines of Christianity.
The problem comes when you study the scripture so much that you begin to see the contradictions in it. You begin to pick out parts where the scripture claims the earth is flat, stars don't move, the moon is just a light. Just red flag after red flag that this religion is nothing more than ancient myths made to govern an ancient culture and explain things about the world that they had no way of explaining at the time.
Atheists haven't read the bible.
Yes, we have. It's ridiculous, and immoral, and unbelievable, and has no basis in the real world whatsoever. Reading your creation myths, and the stories of a frankly evil god that helped one ancient tribe survive, and the story of Jesus and the resurrection and all the filler in between isn't convincing. And before you tell me cool Jesus ain't about that life, I suggest you read, Matthew 5:18-19, Luke 16:17, Matthew 5:17, John7:19, and honestly if you've read through the whole thing yourself, you would know that Jesus not only approves of the atrocities described in the Old Testament, but says all it's laws are still in effect.
Here's a question for you. Have you read the texts of other religions? You deem it fit to dismiss them and then tell me I only dismiss your religion because you think I haven't read the bible. Go ahead. Pick em up. And while you're at it, read up on some books by atheist authors.
Atheism is a religion.
Atheist have no uniform beliefs other than a complete lack of belief in any gods. Outside of our disbelief in gods, we differ on most everything. Atheism has no scripture. Atheism has no (serious) church. Atheism has no rituals. And most importantly atheism has absolutely zero belief in any superhuman controlling entity that created the universe and everything in it, that cares about the every day goings-on of humans, that answers prayers. Atheism is a religion just like off is TV station, abstinence is a sex position, not collecting stamps is a hobby, and bald is a hair color. By definition, it is not a religion.
Theism - ˈTHēˌizəm/noun: belief in the existence of a god or gods, especially belief in one god as creator of the universe, intervening in it and sustaining a personal relation to his creatures.
Atheism - ˈāTHēˌizəm/noun: disbelief or lack of belief in the existence of God or gods.