Those who believe in God blindly accept a moral and ethical code that was invented by men who lived centuries ago. Those men based that code on the cultural mores of their time - there was nothing universal about it at all. In truth they made it up themselves and then pretended that god had done it in order to pursuade others to do as they thought best.
I think the point is that its a basis that relies upon the argument that God is in start point for that morality to exist. Its a separate question whether you know/believe that it was "invented by men." It still does not defeat the argument itself that that specific moral code basis God as its source. The reason being that belief in God is part faith - faith in that those "invented by men" were either Prophets/Messenger/etc. relaying his Moral code.
As a consequence most traditional religions include a number of undesirable characteristics inherited from the ancient cultures that invented them - such as sexism, homophobia, xenophobia, elitism and so on.
In Western Civilization, pre-Judeo-Christian religions accepted and embraced homosexuality (i.e. Greek/Roman religions did not see much wrong with it). Current Western religions no longer embrace that view.