I have added to my list of blogs on the sidebar a blog that is indeed a blog upon which to think. There are varying viewpoints and differences of opinion when it comes to God, the infallibiltiy of scripture, the discussion concerning creation/evolution, politics, philosphy and other issues. The interaction there is respectful and they attempt to lay out the issues as balanced as possible hence the differing of opinions and choice of authors.
I would recommend that you take a look and see how discussions are handled and what topics are covered as they will indeed cause you to think. On the other hand, if you are easily swayed in your thinking and not rooted firmly in what you believe, you may want to proceed with caution as some views are not necessarily orthodox when it comes to issues concerning Christianity and the God of the Bible.
Here is what they have in their profile:
Triskelion (or Triskelos, from Greek τρισκελής‚ meaning "three-legged") is a symbol consisting of three interlocked spirals, or any similar symbol with three protrusions. To us, the Triskelos represents the equal and balanced approach of looking at any issue aesthetically, morally, and empirically. Herein, our contributors discuss whatever they find inspiring, or iritating, and seek to uncover the secret behind it.
You can check out Triskelos here.