Humans who spend time in the wilderness, alone, without man-made mechanical noise around them, often discover that their brain begins to recover its ability to discern things.
For what constitutes a Christian is not; accepting the Christian's creed, but accepting Christ as Savior and Lord. It is a question of personal loyalty and love.
Men point to the sad incidents of human life on earth, and they ask "Where is the love of God?" God points to that Cross as the unreserved manifestation of love so inconceivably infinite as to answer every challenge and silence all doubt for ever. And that Cross is not merely the public proof of what God has accomplished; it is the earnest of all that He has promised.
That Jesus of Nazareth died upon a cross is mere matter of history; that He who did so die was the Christ the Son of God is entirely a matter of revelation.