my 2c: the problem is ppl who believe in darwinism fail to acknowledge darwinism is many things -- some are proven beyond all reasonable doubt, other things are very speculative. so saying it is all proven to be true is really overstating the evidence, and similarly when a creationist say it is all doubtful he too is overstating the evidence. IMO thats why so much of the discussion is not useful.
it is like climate science: nobody doubt the earth has warmed in this century somewhat.. but global warming believers then goes on to say it is known humans are behind this and the trend will just continue unless we do all kinds of crazy things. this is really overstating the evidence a lot.