Religion
Orcs are not a particularly inquisitive people and in general they do not seek spiritual or philosophical answers. If an orc lacks answers to questions of spiritual answers she fears not, someone above her will always know. Instead they look for their place in the hierarchy of things, even in nature and the divine.

Orcs fear and respect those above them, which is also expressed in their relationship to the divine. It is important to do what the divine expects of you, or you will provoke its anger. Since forces of nature also have their hierarchy, an orc can rival them to improve her overall status, by surviving a blizzard for example.

Religion is, as with most things among the orcs, a concern of the group. Prayers and sacrifices are usually made collectively, and under the guidance of a priest. Orcs often raise altars, in honor of their gods, on which they can direct their worship.

Superstition
In general orcs are rather superstitious, expecting the spirits and gods to meddle in their business in minor as well as majors affairs. A common orc would not presume to deal with the unseen directly though, such things are best left to those properly trained. Fortunately the priests stand ready to guide and protect their kin.