When I was 6 months I had a fever of over 102, I stopped breathing, turned blue and was in and out of consciousness. My parents did not take me to a doctor because they believed god would heal me. Could I have incurred brain damage because of this?

I don't believe so, just judging by the way you were able to pull together a sentence with proper punctuation and grammar. Many people nowadays couldn't be bothered learning these skills. I'm curious as to why you are questioning this now? If there were any obvious signs of brain trauma, surely they symptoms would have already manifested themselves by now.

However, when in doubt, talk to your doctor. They would know your medical history and be better able to advise you.