It sounds like Tim is raising the issue of objections centered on supernova remnants in our galaxy, rather than the light from very distant supernovae. That would make it an argument about the age of our galaxy, rather than about Olbers' paradox, which is apparently also raised by creationists. In that case as well, the answer rests on the issue of timescale, there can be agreement on the question of finite age. The importance of that agreement is significant, in terms of finding a common ground. But ultimately, I think the key is agreeing in advance whether the search is for scientific, versus faith-based, truth.