Evangelion was just Anno traumadumping regarding how fucked the production of Nausicaa was, he's joked about how the symbolism didn't actually mean much outside of wanting to look cool several times. What's funny is that Eva IS actually deep, just not because of Christian symbolism or any bullshit like that. It's a look into a man who was so fucked up from the production of a series he was helping to helm that it made him outright suicidal. The depth of Eva lies in realizing how it's Anno trying to come to terms with his place in the world and how weird the Japanese anime fandom had become in the 90s if you want to include End of Evangelion, there is no depth in the religious symbolism.