I dare say you're right to an extent, in that some people may be Christians because they like to have simple certainty in a very complex world, and dislike grey areas. However, many Christians, in my experience, are very good at seeing all sides of an issue, are open to the reality of grey areas, etc.
In fact I suggest that the common demand by skeptics that Christians should offer proof in the order of 1+1=2 may also be an obvious symptom of the preference for simple certainty in a complex world. Quite a few of the areas of 'proof' of Christianity are much more properly assessed by weighing up the evidence than by the kind of logic you mention - if you like, more of a humanities approach than a mathematical one - but I've noticed that when presented with such arguments, many skeptics/atheists just don't seem to register it. They seem to prefer simplistic statements, even though they're often inaccurate on quite a basic level. I'm not suggesting all athiests are like that, of course, but some are. The preference for simple certainty is not the sole preserve of religious people.
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