The topic title, " If some parts of the Bible can't be trusted how can any of it?", is something I've heard from fundimentalist Christians/creationists quite a few times.
Many creationists seem to have an "all or nothing" attitude towards a number of things, including the accuracy and value of the Bible.
I think that many, even including atheists, beleve that the Bible contains valid, usefull information, even if some parts are flawed.
Moose