Well, they're just about to release a remake of the The Omen - wonder if they kept that jackal bit in (see above).

(though I recall that in one of the Warlock movies the fully grown antichrist bursts out of some poor unsuspecting womans abdomen Alien style).

AWESOME! I mean, ew.

I've wondered about this myself a few times and would probably go with human woman willing to be impregnated in exchange for wealth, power...etc.

I could buy this, definitely. I could also buy that she might be a starry-eyed innocent doing it for love. A fangirl, in a way.