Can't seem to let go

[tavarish]

If I understand it correctly, methodological naturalism denies spirituality and is therefore an insufficient philosophy.

By what standard? It has no say in supernatural claims.

Would you use geography to solve a math problem? It's different methods to evaluate different claims.

Supernatural claims have a huge issue in distinguishing their validity. Since the claims are highly subjective, no assessment can be made in terms of their truth value.

If you don't deny spirituality you're not a naturalist (as in deny nature).

Metaphysical naturalist. Look it up. Also spirituality as a psychological concept can be evaluated and observed within methodological naturalism. Sam Harris actually talks at length about this very thing at AAI 2007. It's on YouTube.

Apologies, of course you don't necessarily deny spirituality as an atheist, it's sorta adolescent theism

How is that adolescent theism?