Oh for goodness sake, this is really making a mountain out of a mole hill.
If a non-Christian (if anyone!) reads the Bible and takes the time to understand Christian tradition then their views will have just as much validity as anyone else's.
And of course it is possible and reasonable to have valid criticisms of Christianity after studying the Bible and Christian tradition. and if you want to criticize Roman Catholcism you need to understand RC tradition, not LDS, Anglican, or Baptist tradition and theology.