How can someone abandon Sikhi, when they never had Sikhi. What is Sikhi? A name badge? Just a uniform? No. Sikhi is a way of seeing the world, a way of living your life, and a path of complete submission to the Guru. If someone did everything as the Guru prescribed, and said, "Hang on guys, this is not my cup of tea!" Furthermore, they allowed Gursikhs to talk to them, but were not satisfied and still convinced they wished to walk another path, then one would accept that they have a free choice to do as they please.
http://manvirsingh.blogspot.in/2017/07/exposed-fraud-and-deception-in-name-of.html?m=1