Exactly. With or without a concept of God basic right and wrong don’t change. You just explained exactly why atheists can be atheists and moral.
Again, your mere acceptance that there is right and wrong is, whether you will admit it or not, an acceptance of a "religious" premise. Because your precious science cannot prove the existence of right and wrong. It cannot establish the moral basis of anything, because that basis is intangible.
You're simply accepting morality on faith. Because deep down, you know what is right, and what is wrong. You were born with that intrinsic understanding, which we call conscience.