Irrational Conversions
I have read many conversion stories, both Cristian-to-atheist and atheist-to-Christian. Graham Oppy describes his conversion and reasons for non-belief here.
I think that there are no good arguments--no arguments that ought to persuade nonbelievers to change their minds--for Christian belief as I have just characterized it. Indeed, I suspect that many Christians actually agree with me on this point, insofar as they claim that much of what is involved in Christian belief (as I understand it) is only known on the basis of something like personal revelation. Moreover--though I admit that this is more contentious--I think that there are no good arguments for much weaker claims entailed by what I take to characterize Christian belief, e.g., the claim that there is an immaterial, omnipotent, omniscient, wholly good creator (ex nihilo) and sustainer of all things. Since I have argued at length for this claim elsewhere (see, in particular, Oppy [2006]), I shall not try to repeat those arguments here. I do not think that there is any short route to this conclusion; one simply has to work one's way carefully through all of the extant arguments.