Where do atheists get their morality from?

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Scepticism is a healthy attitude to adopt; it is, after all the default position. That said, try not to confuse scepticism with a blanket, out of hand rejection of what might be evidence purely because it goes against the grain of your opinions. To consider that one may be wrong is the sign a of truly open mind.

I think you'll agree with this: nobody should believe anything they hear on the internet until they can get it confirmed by another more reliable source. I'm a scientist, I like data and new information. For now, this is filed under to be confirmed.

Here's something pretty intense for you to be skeptical about: http://thesalarmy.org/DTMG/miracle12.htm
I'm still skeptical on this report, though I know such miracles are possible. My wife had a congenital knee defect healed in prayer. You should remain skeptical about my claim and the salvation army one because you can't confirm either. BUT, I think you should be equally skeptical about a claim that neither event occurred. That would be the default position. Right?

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How do atheists know what is morally right or morally wrong? Is morality cultural, gut feel, are there any basic principled you can use? Opinions?

Atheism is a very flexible philosophy, so that can vary. Personally, I know when something is wrong when it is unfair or leads to unfairness. For example, I believe murder is wrong because if some one is murdered, they lose their life.

If you could kill Adolf Hitler before he came to power would you do it? In case you are wondering, I wouldn't. I think something worse would be likely to happen.

Many people believe homosexuality is wrong, but I believe it's not wrong because there's nothing bad encrypted in it.

I'm not challenging you on this question, but I'm curious about what you mean by "encrypted in it".