The lack of marketing information about religion is primarily due to religion being somewhat of a taboo subject among researchers
Step-by-step explanation:
Religious topic has become a topic of taboo and arguments nowadays. These are the days where people are judgmental on the basis of religion and faiths. There are also an inbuilt fear that exists in the minds of the people when they express their convictions and belief because it may lead to a relentless argument and debate.
So people keep it confined to one’s own self regarding the religious beliefs and faiths. Also there is an apprehension that people may not be accepted socially if they happen to express their religion and faith.