I have discussed this topic before at some length, but I think it is important to have it summed up in one's mind both for clarity of thought and for potential delivery in an argument. When the argument is made that religion is needed as the basis of morals, you can reply with:
"Religion makes people less moral, not more."
This statement will, of course, require clarification in such circumstances, and that is the payoff for making the statement. It gives you a chance to discuss the moral insanity of religion. You can follow up the statement (either directly or after the religious person responds) with:
"Because it sets the lowest possible standard for morality, the fear of punishment standard, which most people would otherwise naturally grow out of while still young children."
"Religion makes people less moral, not more."
This statement will, of course, require clarification in such circumstances, and that is the payoff for making the statement. It gives you a chance to discuss the moral insanity of religion. You can follow up the statement (either directly or after the religious person responds) with:
"Because it sets the lowest possible standard for morality, the fear of punishment standard, which most people would otherwise naturally grow out of while still young children."