It is a common argument now from the so-called new atheists that we don’t get our morality from scripture. I am not sure that many religious people, even biblical literalists, would defend such a claim...so in a way it really is a strawman. Francis Collins, following CS Lewis, place morality front and center in their justification for their belief in God, but at no time do they say that it comes from scripture. They claim that morality is, in essence, programmed into us as a gift from the divine creator. The universality of altruism is used in an argument from Collins for a behavior that cannot be selected for, and is thus an indication of a supernatural, moral creator. He never once says that the morality comes from scripture. Seen in this way, then scripture forms a guide which may need to be interpreted for the changing times, even if you are a literalist. I think it would be wiser for the new atheists to ask if scripture can even be a good guide for behavior, without hammering the (strawman) point that scripture is not the source of morality.
Perhaps they should poll their audience on the question of where they believe morality comes from. If a significant fraction states that it comes from scripture, then it no longer is a strawman. I just don’t think it would come out that way.