None can be from among the followers of the Messenger. in reality except the one who calls to Allaah with clear insight and evidence (Baseerah):

"Say (O Muhammad! This is my way. I invite unto Allaah with keen insight and sure knowledge, I and whosoever follows me.. [Soorah al-Yoosuf (12):10]

His saying, …I invite unto Allaah… explains his way, which he is upon, since his way and the way of his followers is calling to Allaah. Therefore, whoever does not call to Allaah is not upon his way.

And His saying, …with keen insight and sure knowledge (Baseerah) Ibn al-A’raabi said, Al-Baseerah: (meaning) firmness in the religion…

~ IBNUL QAYYIM ~