It could be that they are continuing from BG1 and BG2, not the story itself, but the antagonist and their motivation. In BG1 the antagonist wants to achieve godhood by orchestrating a grand war (akin to mass murder), in BG2 he uses magic rituals and steals the soul of a godchild for the same purpose, and even ToB, the final part of the saga, it's about taking a dead god's divinity for yourself.
It might be that the absolute is someone who wants to ascend to godhood and uses tadpoles to create and mind control an army of fanatical believers.
