I just finished reading Mere Christianity and was blown away by some of the statements Lewis makes. He mentions "even [God] cannot produce [a changed heart] by a mere act of power...It is something they can freely give Him or freely refuse Him ." (Mere Christianity Book 3 chapter 10)
This brought up an interesting point in my mind: if you believe in the idea of Free Will with regards to Salvation or a changed heart, you indirectly believe that there is something God cannot do. This directly contradicts the scriptures including Matthew 19:26 and Luke 1:37 ( as well as many others, see http://www.openbible.info/topics/omnipotence) that talk about Gods omnipotence.
I grew up in a Calvary Chapel church where Free will was pushed ad nauseum and I was wondering how these Christians as well as other Arminians reconcile free will with something God cannot do.