It’s not so much about accessibility, just quality of argument. As I said, basically no one that has read and thought significantly about religion thinks that Dawkins’ works are anything other than simple-minded polemics.

It’s the equivalent of watching a 5-hour YouTube video about programming and thinking you understand computer science, except that books by Dawkins et al are not even very good, impartial introductions to the topic. All I can say is: if the topic of religion is interesting to you, these are not good books to start with.

I also really don’t think Genealogy of Morality is all that complicated.

Edit: I just remembered this excellent book by Julian Young, Nietzsche’s Philosophy of Religion. I really recommend that if you’re looking for a more nuanced but modern take of what Nietzsche thought about religion.