Please explain when exactly you were and were not a Christian
A pet topic of mine is the tendency of some Christians to fixate on belief and its boundaries. You can't just state why you think belief in x, y, and z is important to Christian faith and life; you have to claim that those who believe x and y but not so much z are not real Christians. You can't just disagree with someone with a different view from yours; you have to stage an inquisition.
It frustrates me to see this all-belief-all-the-time orientation used to frame things as us real Christians vs. them fake ones. When people take a similar approach in drawing themselves outside the circle, it just makes me sad.