Life of Buddha, to be taken seriously?

I've been studying Buddhism for the past few months and part of it entails reading about Siddartha's life story, including his path to enlightenment. What's been confusing to me is whether or not one is to believe all of the "magic" that is described in his past - things like his birth and walking, leaving behind him roses in his path (a newborn baby walking?); or later when he doesn't eat for incredibly long periods; when he creates a golden bridge in the sky and walks it to prove his enlightenment (week 3 after enlightenment);when a king cobra wraps itself around him to keep him warm (6th week after enlightenment)? All of these things seem very unrealistic, akin to stories about Jesus in the christian bible. My struggle is that, as far as I'm understanding and what has truly drawn to Buddhism, this religion is supposed to be based on logic.... these events do not strike me as "logical", i.e., they defy our understanding of science and the material world. Are these stories, therefore, meant to be understood as metaphors, or are they believed as fact? Thanks for any thoughts on this! Kevin