Incarnation

I came across quite a quandry in Christology class today. We were discussing some John Calvin and his take on the incarnation. Calvin spent a couple of sections refuting a guy named Osiander who,

• "asserts that man was created in God's image because he was fashined according to the pattern of the Messian to come, that man might conform to him wome the Father had already determined to clothe with flesh. From this, Osiander infers that if Adam had never fallen from his original and upright condition, Christ would still have become man."

So, the questions I pose to you who are reading are these: Would Christ have still become human if Adam had never fallen? If not, does incarnation become contingent on the fall? Is saving humankind from fallenness all that is accomplished in the incarnation?

Any thoughts would be helpful as I try to work through this.