For information regarding religion, I recommend the blog of a former Christian (Luke Muehlhauser) as an addition to your reading list. That is here: Common Sense Atheism. I recommend this in particular because he completed the process you've started - the process of reviewing Christian beliefs - so Luke's writing may be able to save you significant time and provide you with information you may not encounter in other sources.

Speaking as a rationalist and a Christian, I've always found that a bit too propaganda-ish for my tastes. And I wouldn't call Luke's journey "completed", exactly. Still, it can be valuable to see what others have thought in similar positions to you, in a shoulders-of-giants sort of way.

I think it would be better to focus on improving your rationality, rather than seeking out tracts that disagree with you. There's nothing wrong with reading such tracts, as long as you're rational enough not to internalize mistakes from it (on either side) but I wouldn't make it your main goal.