I've become more theistic over the years. I suppose, if you really pressed me at any pont, that I've always been and still am an agnostic, but as a young man I was far to the atheistic end of the spectrum, and often called myself an atheist, whereas today I am equally far to the theistic end, and often call myself a theist.
In my case I think creationism helped me to move toward a theistic view, but in a round-about way. I was intially intrigued by creationism when I read Francis Hitchins The Neck of the Giraffe many, many moons ago, and then located and read some of the more conventional creationist works (e.g. by H. Morris & D. Gish) that it referenced.
I didn't buy the main thesis of the creationists, but I thought they might be on to something, that they may be indentifying (if overinterpreting) some real problems with conventional evolutionary theory. So, being a young man then, and having the time for such things, I spent my spare time over several months in some good academic libraries tracing out the footnotes from Henry Morris, Duane Gish, et al.
What I discovered was that creationism was complete, utter and unmitigated bovine excrement. Not one significant creationist claim or interpretation that I investigated checked out. Not one! The evidence supporting them simply did not exist in the original sources, although compelling evidence for their contradiction often did. I was pretty shocked by this actually. I had a great respect for books and, naive young fellow that I was, wouldn't have believed that people who wrote them could engage in the kind of pervasive and perverse prevarication that I discovered.
I also discovered as a result of my investigations that the evidence for evolution was very much stronger than I had imagined, and that the theoretical basis was much more carefully considered and elaborated than I ever would have guessed. So reading the creationist literature transformed me from being somewhat skeptical of evolution to having great confidence in the theory.
At the same time, the realization that, "well, this is clearly b.s.," sort of took a literal interpretation of creation, and corresponding ideas of a tinkering, interventionist God, off the table for me. This eventually led me to think about deeper ways that God might be related to the world as its Creator. So reading creationism also (over a longer time span) did also make me more theistic, but only because it realized it was wrong!
I was, for most of my life, very fundamentalist Christian and believed in Creationism...that is, until I went to college. Like you, my investigations revealed the same thing - that the evidence for evolution was well-researched and staggering not only in the sheer volume of information amassed, but in it's complexity and far-reaching implications.
At the same time, the realization that, "well, this is clearly b.s.," sort of took a literal interpretation of creation, and corresponding ideas of a tinkering, interventionist God, off the table for me. This eventually led me to think about deeper ways that God might be related to the world as its Creator. So reading creationism also (over a longer time span) did also make me more theistic, but only because it realized it was wrong!
Precisely! Any God powerful enough to will the Universe into being would not need to be tinkering about with His creation. He would have thought it all out ahead of time and known what would happen, where it would happen, and when it would happen...and herein lies the irony of the entire Christian-Creationist dogma. Christians are very big on claiming omnipotence, omnipresence, and omniscience as characteristics of God...but in reality, they do not believe it...for in their world, God must act directly from time-to-time to "fix" His creation, insert a species here, or take one out there.
To paraphrase Darth Vader, I find their lack of faith disturbing.
Like you, I've drifted around within the agnostic spectrum, but continued to believe that nobody who claims to know for sure that there is or is not a God has a clue. For sure, God shouldn't be telling people to sabotage science teaching, or to get out there and lie their keisters off for him.
That's why some of the original sources found in the designeduniverse links are so precious. Anyone who reads the original source, then the "interpretation" will get an education.