I assume you currently believe Christianity to be false. Your problem sounds like confirmation bias. It's actually great that you notice it! Do you know the lintanys of Tarski and Gendlin? I'd say they are quite popular around here. They generally help me to reduce that negative gut reaction when I'm contemplating the possibility of being wrong.
If you used to believe in Christianity you most likely were biased in favour of it, but still changed your mind. The bias from back then and the bias from now should cancel each other out to some degree.
I've done some reading on this site (nowhere near enough, judging from my current situation)- the question is what methods I should use to account for bias problems when dealing with factual questions related to Christianity.
I've noticed during my thoughts on the issue that I seem to be biased against Christianity- although raised in a Christian household, I have noticed that I become more tense when reading effective arguments for Christianity and more relaxed when reading good arguments against it- I also feel strongly tempted to pull out books which I know give good arguments against Christianity.
I thought the issue of whether Christianity was actually true concluded- but given that I am now aware I'm biased, it's difficult to be sure. On the one hand, there is a lot of evidence against it (biblical contradictions etc...). On the other, there are some pieces of evidence that appear false 'on the surface' but which seem plausible when I take my bias into account.