Well, I'm no fan of Catholicism, but I think your reasoning may be erroneous.  You need to identify what it is about the Catholic meme (or memes) which is problematic.  Because Catholicism has been so powerful, it has commited many of the greatest evils.  But many of these are likely to have been caused by politics, rather than Catholicism per se. 

And really, it's ridiculous to blame the RCC for Nazism, unless you can show that the church had a determinative role in creating the conditions that allowed it flourish.