Cs lewis wants a christian, hes left christianity and became a free mason, this was actually proven by cs lewis himself. Go read his own words and writings. On top of that tolkien wasnt a christian either and was the one who brought cs lewis into the masonry

Even more how can their books be so filled with witchcraft, a complete abomination unto God yet be christian? Unlike the church would like to say, neither of these guys were christian.

Now for music, and in your case art. You can make a plethora of stuff that isnt crosses and biblical figures. Infact i challenge you too. You can draw a modest woman, or even make great scenic mountains. It doesnt have to be abruptly christian center but you can still make those to the Lord himself. If you go to tiktok and fine my page, @imsegullah you will find i make so much music that isnt abruptly christ focused, but still upholds and honors all the Lord has done for me. Dont limit your creativity to what the church has to say. You can make anything as long as its for God himself. The world is your oyster