A few months ago there was an interesting post by Nicholas Batzig, A Biblical Theology of the Trees of the Garden. He contends that the Tree of Life and the Tree of the Knowledge of Good and Evil did not have any inherent magical powers. Rather, both trees were sacramental symbols, pointing to a reality beyond themselves.
Can we harmonize an historical Adam with evolution? Many Christians believe so. Consider, for example, a recent Christianity Today article, "Where Did We Come From?", by Pastor Andrew J. Wilson. According to Wilson, Genesis says nothing about Adam and Eve that is contradicted by Darwinian evolution.