IMHO -
Anyone who has a personal relationship with Jesus Christ - fully God, fully human, the Great I AM of the scriptures - and believes that His death on the cross paid the penalty for their sin, who believes in the Trinity (One God - Father, Spirit, Son), who repents and does their best to live a life dedicated to following Jesus’ commands, that person is a “Christian”. Their denomination or particular church affiliation does not determine their status.
Nice post, I agree. I wonder if muslims have these sort of discussions over their religion. Somehow I doubt it.