I work in a city with a large "megachurch," that attracts followers from miles around. I'm not religious, but a number of my coworkers attend the church. It holds a lot of classes, social events, and so on, so the employees who are church members spend a lot of time together outside of work. Recently, my department got a new manager who is also a church member. Almost immediately, he started playing favorites in assigning work and doling out training and other opportunities. It seems like employees who are church members are getting all the benefits -- and the rest of us barely exist to him. Is this legal?