Priests\clerics\etc..in gaming terms
The gods of the Abeir-Toril are real beings. They grant magic to their worshipers and grow or diminish in personal power in relation to the number of mortal worshipers they possess. Priests in the service of a god advance in rank only if they please their deity by remaining faithful to their power's aims and rules and behaving as their deity wishes. Most folk in faerūn consider it wise to known he religious affiliations of persons they must trust, do business with, or adventure with---but they take care when seeking to learn such things, since it is often an affront of the highest order to ask about religious beliefs openly. Some folk have been known to attack individuals inquiring (even obliquely and with the greatest politeness) as to their faith.
The plethora of divine beings and the wide variety of portfolios which the represent or epitomize has led to general tolerance of the beliefs and worship of others in the Realms. Among the general populace, this extends to all who do not break the law (but human sacrifice is generally considered murder, and the unauthorized use of another's goods as offerings is theft and in some cases also wanton destruction). Individuals, however---particularly members of a priesthood---may be not at all tolerant of the beliefs of others. It is considered impolite to inquire too deeply into the details of worshiping a god one does not serve or is not likely to venerate.
You are the