Just a note: I did have my previous statement backward. It seems according to Michael Tremonti that Scott did about 90% of the lyrics on the MOP and Mark contributed more lyrics on the other albums. See this thread which has some good conversation regarding this:
http://www.creedfeed.com/community/s...ead.php?t=5560
Take a close look at page 3. Michael (Gabriel) makes a good post describing how two songs were done. He mentions that for Bullets Mark had the entire song music-wise written but had no idea regarding lyrics and how they should be sung. But on One Last Breath, Mark had everything written out - music, melodies, and lyrics - and Scott took Mark's lyrics and rearranged them and added new verses. He finishes his statement by saying that in general they both contributed.