Lots of stuff going on in the blogosphere about hell. This is a really difficult issue on many levels, but important nevertheless for those who labor to see Muslims, most of whom have never heard the gospel, embrace the Messiah for all he is.
I think this quote from J.I. Packer quickly gets to the heart of the matter:
It has been urged that if non-Christian devotees come to know themselves as guilty, defiled, and unworthy, and to confess and renounce their sins, asking mercy from whatever gods there may be, they will receive the forgiveness they seek because of the Jesus they do not yet know, but will know hereafter. God forbid we should dispute this. But have we reason to think there are such people? The New Testament only speaks of penitents being saved through knowing about, and coming to trust, the crucified and risen Lord.