What do you mean by ‘art’? You seem very visually inclined. I see no mention of writers in your blog and do I really need to add there are many atheist writers? No sure what the impact of atheism on music is, but it’s influence on philosophy is profound (the impact of religion on philosophy is pretty destructive and limiting …)
I’m reading Nabakov at the moment … it seems to me that he is more likely an atheist. Why? Well, I find it really difficult to imagine a religious conservative writing a prison cell memoir of a paedophile and murderer ….
As for the visual arts? Well, are we sure that Michelangelo was really a believer? May be the art just represents the patron who funded the project, viz. the church …..
What about the art that is limited by religion? I don’t know of any great Jewish art or Sikh art and Islamic art is utterly limited to drawing pretty patterns and caligraphy.

That should be your work.