By former New Zealand chess champion and creationist Dr. Jonathan Sarfati:
Jesus’ existence didn’t begin with His birth or conception, but pre-existed Creation, as made by Him and for Him. Jesus was both with God and God Himself. That such a divine Person exists is taught throughout Scripture, starting in Genesis. The plurality within the Godhead makes it possible for God to be intrinsically a ‘God of Love’.
In Jesus, God took on human nature, so He could die for our sins as a fellow human, taking the penalty we deserve for our sins. In fact, this was planned from Eternity, as the names of the Redeemed were already written in His Book of Life from the foundation of the World.
When Jesus took on humanity, this was an addition to His divine nature, not a subtraction of His divinity. Thus everything He taught, He taught with authority—including about Creation and the Flood.
Read the remainder here: http://creation.com/incarnation-why-god-became-man