Did Adam and eve really have a choice?

I think that you may possibly be taking this Genesis account to literally.The talking snake sounds like an allegory of other religions around the area -- religions which venerated the snake as something holy.The tree of the knowledge of good and evil, on the other hand, sounds to me more like some kind of hallucinagenic plant -- something which the forgeign religions in the area did use by the way.In fact, many ancient religions used hallucingenic drugs (from both plants & snakes) in order to gain "spiritual wisdom"...thereby "opening their eyes"... Do you believe the above allegories I've suggested might make more sense than a literal snake and some magical fruit?