Well THAT'S a big question, I won't attempt to answer. But I might phrase it differently: 'should' they have that right ... since I prefer to assume that we get to decide which 'rights' to apportion, rather than that we somehow discover the 'rights' that already exist .... And to begin an answer to such a large question you'd have to begin working out very general views on the nature of morality in general, as well on the relationship between public and private, and more -- and no doubt you might like to distinguish between such cases as "purely" elective abortions v. those which are in some sense medically-motivated or "necessary" (eg threatening the life of the mother) ... Even more interestingly, esp with respect to the latter distinctions, you might want to explore exactly how it is that abortion has come to be so vehemently opposed by the Catholic hierarchy -- in fact I recently was reading that until the 20th century the Church's opinion on abortion in general was far more liberal and lenient...

What a deep and important question! Obviously a detailed answer might look at the detailed tenets of various religions and evaluate them individually ... But a briefer reply would offer both something in support of, and something at odds with, your own way of thinking. First, in support: there's no question (it seems to me) that human beings vary along every possible dimension, and that there are both 'good' and 'bad' (and 'great' and 'horrible') people to be found both within any major religion and outside them. For many individuals, their goodness/badness may well be prior to, independent of, their religions -- and in no way dependent on the religious belief. (They may even choose their religion because it best expresses their pre-existing goodness.) Moreover, in further support, it's not very clear just what ARE the specific official tenets of any particular religion -- each individual believes some particular set of beliefs which may overlap little, much, or almost not at all with...