Lawful: "the belief that everything should follow an order, and that obeying rules is the natural way of life"

Lawful means you obey the rules. However, presumably you have your own set of ethics, as well as probably the belief in a god that also has their own rules. You have to reconcile these. Obviously if your god is about protecting innocent lives and you think the babies being eaten are innocent and deserve protection, you probably aren't going to obey all the laws in the KoBE.

Nah, there's a whole bunch of Lawful Neutral deities that uphold natural laws, and the Great Balance, like Jergal, Kelemvor, and Mystra. A lot of Good/Lawful Good deities as well, especially when it comes to the natural passage of life and death. Messing with that natural law gets you on the wrong side of like half of any given pantheon. There are even evil gods, like Bane, that are all about law.