To really discuss this, I think that you need to look at the Solidarity Service that Bernard attends. The first post here says that there is no religion outside of the Reserves, but I would argue that the Solidarity Service is religious in nature. I think it shows that Huxley takes something of a Marxist view of religion.
The Service that Bernard attends is clearly an exercise in fakery that is meant to satisfy the needs of the attendees. The attendees (other than Bernard) have their emotional needs met through soma and sex in this ceremony. This ceremony, then, is an "opiate of the masses" like Marx says religion is.
So, I would say Huxley is anti-religion. He seems to be portraying religion as a set of actons that have no real value but are meant to keep the people from being unhappy.