An allegory is representation of an abstract or spiritual meaning through concret forms - a symbolic narrative. Do you read this story of the man , boy and the fish as a tale with moral or religious significance?

I see the religious significance first. Santiago is very much a Christ-figure. Santiago's hands are cut by the fishing line. This combined with old cuts are symbolic of the suffering of Christ and his stigmata. When the sharks ravish the meat of the Marlin the meaning of Santiago as Christ-figure deepens. He moans in agony as if he is "having nails driven through his hands." Santiago's defeat is man kind's defeat yet in his defeat there is a sense of redemption. He returns empty handed (except for the skeleton) yet he has attained what others once laughed at. The boy Manolin tends to his wounds like he has been taken down from a cross.