Morality is about doing the "right" or "good" thing.
From my observation, the only "right" or "good" thing that makes sense, and is not in conflict with religion or atheism...is the golden rule.
For the most part, for most people who do not have serious mental illness does the following hold mostly true?
If it is good to kill, then why do killers not want to be killed?
Why do thieves not like to be robbed?
Why do cheaters hate it when they get cheated?
Why do liars not like to be lied to?
So, it seems that it is human nature to hold up as virtuous and good...not to be killed, lied to, robbed, or cheated.
So good and moral would be the way in which we want to be treated...and the golden rule suggests that we act morally, which is to treat others the way we ourselves want to be treated.
Is the golden rule a product of man's mind or is it from God?
That is a different question that could be debated, but morality as such, doing the right and good things are rather obvious if we only look to our own human nature and look to the way we want to be treated.