The big publications I go to for my Christian slanted articles are Publishous and Koinonia. I found out about Koinonia first and I love working with their editorial staff.
Having negative feedback and personal attacks are hard, but realizing it’s more about them than it is about you helps you keep an adequate distance. I used to not be able to take it well and feel like I had to defend myself to everyone — now, I pick and choose my battles. You get used to it.