How is the comparison of gatsby with Christ (he was a son of god and he must about his father's business) ironic?

I've never seen or heard of this comparison but I suppose it could be due to the fact that Gatsby went about in everyone's business, making sure he knew absolutely everything. In a way, when Daisy comes over to Gatsby's house, he seems to have everything a person could desire, making him look amazing and powerful to Daisy, which I again suppose could be related to the amazement of Christ and power in which he withholds ...