If possible, I wouldn't worship any Daedric Prince. They do not care for you, are neither "evil" or "good", and worshipping them can easily take a turn for the worst.
If i HAD to, I'd say Meridia (hate of undead) or Azura, as they are relatively safe to worship (not talking about whether Azura is kind of a [censored] or not).
As for Molag Bal, he is the Daedric Lord of domination, which counts as much for physically overpowering his foes (right through might), as simply "breaking" his opponents (see his quest in Skyrim), and also sixual violence, which is why he is also known as "KIng of R A P E" (damnable censor function). Which btw is how he made the first vampire (violating a Nedic woman), and probably how he turned Valerica and Serana in Dawnguard:
All in all, his domination is pretty much always of a violent nature, and six, murder, and abuse are all part of it.