You're right in this regard:  The abortion issue turns not on religion, as Don Alexander would have it, but on the question:  What is this newly conceived being?  If the answer is, "A human being," then its life is as worthy as a new born's.  If something else, then abortion is no big deal.

You say the matter is one of opinion.  But opinions are given weight to the extent the square with facts, with reality.  No one doubts that a newly conceived zygote is a unique and discrete living being.  Nor can there be any doubts that its being is human.  It simply can't be anything OTHER than human.  It is, then, an actual --- not potential but actual --- living human being.  Thus, we can justify abortion only if we say that we can kill a living human being without violating the right to life.  That is an extreme, self-contradictory position.