Sigh, now there's some convoluted "logic". We can't object to anything that is not prohibited by ALL faiths? Our faith, our morals are worthless, yet the "faith" and tenets of every crackpot cult out there determine the validity of our beliefs? This is the basest, filthiest sort of multicultural equivalency.
By his reasoning, here in America, we should be able to commit any atrocity that Islam allows and encourages.
I have never felt that opposition to abortion needs to be based on religion, it is purely science that the fetus is a unique, living, human individual.