How mant different religions are there in the world?

I think there is nothing like different types of culture. A mans life style is his culture. A group of learned men form a society and adopts a life style which will become their culture. Culture of any such groups, religion or nation will get influenced/ overpowered by other groups, religion or nation, when they intermix either in the society or through media, culture of ones can change unlimited times. hence the 'types of culture' is ruled out.