Divine Nature & Human Nature

In order to sufficiently answer Di's quesitons I decided to dedicate a post to some of the issues brought up - and some of them ones that I haven't really thought about. So I appreciate the questions because they have caused me to think more deeply about the Incarnation.

Virgin conception
It's often referred to as the virgin birth, but it's better to call it the virgin conception. This is because, Mary was made pregnant through supernatural means. Hence, she remained a virgin, though she helped to conceive. Why is the virgin conception important? I would suggest that if Jesus is fully God and fully man, then He would have to be conceived of differently than a typical man. Some theologians have denied that the virgin conception is important, but I thought of two reasons to maintain this position: (1) prima facie reason, the Bible teaches it; (2)this tends to lend credence to the idea that Christ is fully God and fully man, the processes that brought about His birth are supernatural, yet natural.

Sin Nature
Is the sin nature of humans and essential property that humans must have? --No, it isn't. Adam and Eve were fully human, yet they both lacked the sin nature. Only upon sinning did they receive the sin nature. Remember, Romans teaches us that Jesus is the second Adam. In other words, Jesus is a human as God originally created humans - without sin or a sin nature. So is it meaningful that Christ was tempted? Just because He was tempted doesn't mean that He sinned, or wanted to sin. What does it mean to be tempted? I would think that the offer of solicitation would be enough for a temptation. The rejection of this offer could be without hesitation, yet, the temptation would have occurred. Temptation doesn't imply sin nature. On the other hand, if Christ did have a sin nature, then He would have been a sinner. Having a sin nature implies that one is a sinner, hence one is guilty of sin.

Omnipotence
I'm not sure why C.S. Lewis would claim that God has to give up some of His omnipotence if humans and angels have freedom. I'm going to assume that Lewis means that humans and angels have libertarian freedom. Yet, this would imply that God loses some of his omniscience. Perhaps through losing some of his omniscience, God loses some of His omnipotence. His ability to react and use His power is limited by His loss of knowledge.