Atheism and morality

[Inigo]

There IS evidence, I keep presenting it. Morality instructs and its instructions have inescapable rational authority. Those are CONCEPTUAL CLAIMS. So our concept of morality is of something that has those features (a concept we have formed on the basis of our moral sense reports - reports that give us the impression of external instructions that possess inescapable rational authority).

Now, for there to be something answering to the concept there would (by definition) need to be some external instructions with which we have inescapable reason to comply.

The only way those sorts of things could exist is if a god exists who is issuing them.

Hence, our concept of morality is of something that can only be a god.
You might prefer that this was not the case. YOu might prefer that morality not turn out to be a god (or the instructions of a god if one prefers). Fine. But unfortunately that's the only way there would be something answering to our concept.

The concept of which morals are good instructions to follow and which ones are bad are different and many contradict each other, so then your claim must be that there are many gods and not just one?

No, the reverse is true. My belief that Xing is wrong contradicts your belief that Xing is right if and only if we are talking about the same morality. So, my belief that Xing is wrong is the belief that morality instructs us not to X. Your belief that Xing is right is the belief that morality instructs us to X. These beliefs contradict. But they are beliefs about one morality.
If my belief was that morality1 instructs us not to X, and your belief was that morality2 instructs us to X then our beliefs do not contradict.