While the aforementioned problems certainly pose a problem for proving that the Christian God is immutable, it is the act of the Incarnation that is seemingly the nail in the coffin for Christianity. In the act of the Incarnation we have God becoming man, which indicates a drastic change. Likewise, if we say that Jesus was God, then how can it be said that God does not change? After all, Jesus grew older and grew in knowledge, both of which are indicative of change. Thus, if Jesus changed and Jesus is God, then certainly the God of Christianity must be mutable.
While a human being, God grew in knowledge. There is little evidence to suggest that Jesus came out of the womb acting like an adult. In fact, we know from his stay at the Jewish temple that he continued to grow in knowledge. We know that he didn’t come out of Mary’s womb fully grown; he was a baby. This means that he grew into a man, indicating that he changed physical status while growing up. If Jesus was God, then certainly this would indicate that God is capable of change.
Another objection critics could bring up concerning the Incarnation is that we have God changing into another nature. By taking on a human nature, so the critic says, God became something different. God didn’t have a human nature and now he did have a human nature, which indicates a change. This would show God to be mutable.
The critic could point out that no matter how nuanced we are in explaining the Trinity, the change encountered in the Incarnation proves that the Christian God cannot be immutable. For instance, if we say that is true of the part is also true of the whole, then what is true of Jesus is true of the Trinity. If my hand is infected, then it is proper to say that I have an infection. If the person of Christ changes, then it is proper to say that the Father and Spirit change as well. Continue reading