Partialism
...taught that Father, Son and Holy Spirit together are components of the one God. This led them to believe that each of the persons of the Trinity is only part God, only becoming fully God when they come together. [monergism.com]

For Christians having dreams and becoming Muslims, please see:
http://thefactsaboutislam.blogspot.co.uk/2014/03/christians-are-having-dreams-and.html