Hardly. I've been told that I'm an agnostic monotheist, so while I'm a believer in God, I possess a highly skeptical mind. If I went atheist, I would still hold this position.
Such as the case where skeptics believed that that the Iliad was entirely made up out of whole cloth... UNTIL we found the city of Troy. Now we must admit that we don't know where the dividing line is between the historical and the myth.
Not at all. I for example find the gospels interesting from a Jewish perspective, as part of the caldron of ideas from which Rabbinic Judaism emerged. There are for example, some links to what became established Oral Law, and arguments in the same tradition as are set down in the Talmud.
At any rate, all of it, the historical and the fiction, is interesting if for no other reason than it became the dominant religion on the face of the earth, all starting with the life of one Jewish man. We Jews have disavowed him because he has been the cause of such great and persistent suffering for us. But if we stop and think about it, he was the most influential Jewish man in history. And if you pull back the layers of legend, all he really wanted to do was teach Torah.