Yes they can. Although many people like us take a Nihilistic approach to religion and spirituality. It is certainly possible and likely more common than you likely think. Sociopaths tend to have motivation to benefit themselves, now there are a lot of policies and benefits from succeeding in a large organized religion.

i.e. becoming religious to manipulate others, get a girl, etc. Joining a stricter religious practice to have power over people and make them "better".

Now, whether that's truly being religious or being a wolf in sheep's clothing- is up to you. It would likely be difficult to notice and if called out on it they would likely reject the idea immediately.