The most useful thing I have heard anyone say about the differing views Christians have on this subject, was Chris Wright at Spring Harvest in 2006.
Unfortunately I didn't note down his exact words, just rough notes. But it was something like:
Christians who believe in a young earth etc shouldn't assume that those who don't lack integrity as to the Bible.
Likewise, those who believe in theistic evolution shouldn't assume that those who don't lack intelligence as to science.
Good advice. Remembered it for 10 years!