I have questions about the data (how do they know 4/5 of fertilized eggs never implant?), but even assuming it's true, I think the questions at the end are very disturbing and have tremendous implications as to how one ministers and teaches on this subject from the pulpit.
We're up to about 80 comments on this topic so far, spread out among 5-6 of us. I'm surprised and saddened by the fact that others have been not only sympathetic to the questions, but also have been advocating such things as: a baby has no soul until she draws her first breath (because of some twisted understanding of Gen. 2 and Adam becoming a "living soul" after God breathed into his body), an embryo/zygote/fetus is only a potential human being (despite all evidence to the contrary), and that it is problematic to assume that aborted embryos go to Heaven because (gasp!) Heaven would then be filled with babies.
So it seems the main problem these guys have is that because of the fact that, according to the Christian pro-life position, the majority of conceptions die; therefore, it is problematic to think that Heaven is "filled" with undeveloped embryos or tiny babies. Apart from a complete lack of thoughtful study of Scripture and application of logic, it's just stupid and wrong. I mean, really? Heaven's glory is tainted by the presence of human beings whose only crime was not living long enough?
I'm pretty sure God has thought about this in advance and has made necessary arrangements. Maybe God will allow those babies to grow up in Heaven, until they reach the "age" at which we all will be in Heaven. Maybe they'll enter Heaven fully formed; God is not bound to preserve embryos as such forever.
Additionally, I'm truly horrified by the "logic" that states that a baby has no soul until he/she draws first breath outside the womb. The only difference, the only difference between a newborn and a baby one minute from birth is location. There is no ontological change that occurs in the baby during the trip from the uterus to the outside world, no reason whatsoever to believe that one minute before birth, the baby has no soul and is therefore not a human being made in God's image, and the next moment, the moment of the first breath, when bam! they are suddenly not just a living mass of cells, but a soul-indwelt human being. John leapt in Elizabeth's womb when Mary (pregnant with Jesus) visited. How would that be possible if neither John nor Jesus had a soul? The same logic that applies to personhood applies to ensoulment: does the baby have a soul one minute after they are born? What about one minute before that? And one minute before that? And one minute before that? If the soul exits the body at death, isn't it reasonable to assume that the soul enters at life, which begins at conception?
My brain can hardly keep from exploding. This is a group of ministers! What are they teaching the people at the churches they serve?