belief in Adam and Eve is absolutely essential to our Catholic faith.
Belief in evolution is not excluded by belief in Adam & Eve, nor vice versa. Genetically speaking there is documentable proof of a common “Eve” ancestor. By examining the mitochondrial DNA of as many races as possible, scientists have established that there
was indeed one common lineage. “Adam’s” lineage has also been traced. From estimates, Adam existed prior to Eve (in accord w/ Genesis - see my later thought on that).
Source
Since God is all powerful and all knowing would it not be possible for him to
use evolution in His creation? The days spoken in Genesis do not have to be literal days b/c as we’ve already established, God’s time is not ours. Since evolution (to a point) can be shown via common ancestry, etc, I’m not going to jump off the deep end & say it can’t have happened that way. What I believe is that evolution was God-directed instead of merely directed by survival of the fittest/etc (although, these facts are part of God’s plan IMO). My personal belief, which at this time is neither refuted or confirmed by science (to my knowledge) is that the ‘missing link’ everyone is searching for is actually the miracle that God put an immortal soul into that creature to change it from an animal to a human. The reason the ‘link’ cannot be found is that the imposition of an immortal soul did more than just metaphysically/spiritually change the organism, it also physically changed it.
Back to the original question…
Zygotes are human. Human souls are in Heaven - not necessarily our physical bodies from here on Earth. We rely on a merciful God to allow these innocents into Heaven, but we do not
know b/c it is not our place.
To my way of thinking (not necessarily doctrine), aborted babies have a more assured place in heaven b/c they suffered during their death. The same may be true for naturally aborted (miscarried) babies, although their suffering is unknown. There is the school of thought that suffering leads to salvation - that whole Take up your Cross and Follow Me and/or offer it up to God.
Abortion can never be thought of as better for the babies than life b/c it robs them of their fundamental right to life & ability to use their free will God gave them. To say they are better off aborted would be like saying we should kill all children b/4 they are capable of sin to ensure their salvation. Salvation can be helped along (IMO) by suffering, but it is also generally thought that free will is necessary for salvation. In other words, simply being alive then killed prior to the ability to make any choices for or against God, does not guarantee salvation. Salvation/damnation requires a conscious decision (as I understand it). I think that is where Limbo came into effect b/c aborted (naturally or unnaturally) babies do not have the capability of conscious decision-making prior to their deaths. Neither do infants or unbaptized children. However, even though baptized children/infants may not have made a conscious decision, one was made on their behalf to begin their salvation path. At the point of baptism, the child is washed clean of original sin and becomes a clean slate. Since that original sin stain is removed, they are in a ‘better’ position than the unbaptized to reach salvation. However, even their salvation is not guaranteed (to my knowledge) b/c again
they have made no conscious decision to follow/reject God’s path.