What is puzzeling is that there are seemingly intelliegent people that believe this fairy tale...
There's not a human being ever been born ('cept Jesus Christ) who ever had an infallable 'second' during his/her lifetime...
This is a good example of the truism that those who refuse to venerate Mary as the pinnacle of God's creation end up venerating Jesus as the pinnacle of creation, instead.
... thus demoting him severely.
Jesus Christ is not, and never was, a "human being". He's a Divine Person with a human nature. To call him a "human being" makes him less than God.
Just to clarify: With all due respect, Mary is not believed to have been "infallible" (unable to sin or make mistakes). She is, after all, human, and throughout her earthly life was surely tempted and quite able to sin.
Instead, we believe that Mary, "in the first instant of her conception, by a singular grace and privilege of Almighty God, and in view of the foreseen merits of Jesus Christ, the savior of the human race, was preserved free from all stain of original sin." We also believe that, with God's grace, Mary preserved this purity throughout her life and did not commit any actual sin. This doesn't mean that she could not sin (infalliblity), but that she did not sin.
I see....so Jesus was born of a stained vessle?
Oh, it gets worse, even more puzzling. There are seemingly intelligent people who for years did not believe it and even argued against it, and had theological educations to help them do so, and then they thought and prayed and prayed and thought and came to believe it!
It's clearly a plot.
;-)