On the contrary. Religion is basically a mechanism that the developers had chosen that would add conflict in diplomacy, and add happiness and some small bonus research. That's basically it. All the religions in the game behaves similiarly, because the game developers have said specifically, in the manual, that they're game developers, not theologicians.
Is the intro story thing sound bible like, maybe, but it can be the case that both the game developers and the Bible wants to be theatrical.
And besides, there's at least 1/4 chance that a couple would have their first 2 children to be boys, 1/4 chance for the first 2 to be girls, and 1/2 to be one boy one girl. Could be the case that the settler family simply had two boys (and frankly game developers aren't going to waste CPU cycle to make sure the two kids are different every time you have a settler).
Is every 4-member family you know that has two boys must be Adam and Eve, with Cain and Able? I doubt that's the case, or I might have to start calling my Polish-Canadian friend Cain.