New data is showing that while we may have been made to believe that if you are not Shia then you are Sunni, this is not actually so.
Millions of Muslims and indeed a majority in many countries reject both sects dividing Islam and simply call themselves "Muslims," according to polls.

The popular narrative that of the world's Muslims 85% are Sunni and 14% are Shia is quite false as many called Sunni never alluded to such sect division and do not even know the requirements and stipulations of being Sunni.

This video explores:

A 2012 Pew poll with Muslim affiliations by sect and non sectarianism:

The non sectarian Muslims from the Pew poll are displayed on the column on the far right/by country in this image:


Other references and images can be seen here:
Attached Images