Which changes the Incarnation of Christ radically. If we are evolving as a species, then what humans were then is different now.
Not necessarily. Our (religious) definition of "Man" is not the same as an anthropologist. Our first man is a man with a soul, not the "evolving" homo erectus, etc. A man has a soul, and the first such man was Adam, created by God with a spiritual soul. Thus, THIS is whom Christ came to save, and what nature He took up, the man with a soul, not the homo whatever (presuming that science is correct on this theory). We are open to this possibility, as it does not deny the Word of God.
Brother in Christ