No.
If they had an objective moral code, it would be written and published widely.
I saw a poll on Quora. The question was:"Is lying moral". Out of eight atheists who answered, 7 said lying was moral sometimes. That's why theists don't trust you.
I think you are way off base Viktor, to generally paint athiests with a broad brush.
God seared right from wrong in to mankind....then he gave us free will.
Atheists and Gentiles will be judged, on that basis.... Right from wrong
Christians will be judged via our belief, that Christ sacrificed Himself for all sins.
Jews will be judged by the Law.
As far as Atheists responding that in SOME CASES, lying is ok.... Most people would agree...
If a friend who is ugly asks, "Am I ugly?"
Most friends would say, No.
If your wife has a new dress she is going out in, and you know how much she loves the dress, and asks, "Do I look ok? Do you like the dress?", when you are not that crazy about it....are you going to be brutally truthful, or let your wife be happy in her moment?