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.