This is a manifesto, mostly written for myself, but perhaps it may help you.
The temptation is strong. Fight it!
Coming out of Christian fundamentalism, there is a temptation to jump right to the next fundamentalism. Angry Atheist is the first one that springs to mind, but there are others. Once you are used to having a community that tells you what to think, it is difficult to move away from that and do more of the thinking for yourself.
And that’s the thing. You have to think for yourself, or you may end up committing to yet another ideology that betrays you.
You don’t have to fight Christianity; it doesn’t need to be a war.
No idea is untouchable
Avoid living in a way where some rules or ideas are untouchable. You do or believe things because the group says you do them, but you haven’t dug into exactly why these things are done or believed.
Be curious. Seek to understand. Follow your doubts. Doubt your doubts. But do it all rationally.
Think for yourself as much as you can
Avoid the temptation to follow a group because it’s easier than figuring things out on your own.
Do learn and process things in a community–where you can–but be mindful about it.
People are more important than ideas
Learn to connect to your fellow humans for their own sake. Everyone has a story, some might even share with you. Everyone can benefit from a listening ear. People aren’t “projects and objects.” They’re people (hat tip to Matt, in his episode). People from your former faith are still people, our fellow humans.
This isn’t an exhaustive list. In short: I don’t want to go back to being a fundamentalist.