Beyond these suggestive comparisons of Gatsby to Christ, Fitzgerald explicitly states Gatsby's quasi-divinity. Gatsby is a self-created deity. The identification of Gatsby with Christ is inarguable. However, despite this direct evidence, Gatsby is not a Christ-figure. The prevailing tone of the novel is one of artificiality.
Nothing is as it seems.
The commentary on the Jazz Age is that it is all sparkle and not substance. The problem with Gatsby's incarnation is that it is too complete. He has come too low to hold divinity. The God whose Son Gatsby is is the God of money, power, prestige and falsehood. This lost godling is appropriate to his worldly kingdom, but his power to redeem is too limited for the fullness of Godhead.