No. I do not argue on when during a pregnancy a child begins to exist, or when it has rights. In fact, not even my parent argued these or any similar point. You are the first in this chain to bring it up here.
Please read my comment carefully. I do not argue whether abortionists are or are not intolerant. Precisely because, as you say, that depends on deciding when a child's existence and rights begin, which is not the debate we are having.
I argue instead against my parent's claim that abortionists can be called intolerant of religion simply because a religious party wants to impose their own religion on the expectant and thus force them into not aborting.