You take a risk here, @ubani1, in presenting a character with a viewpoint that might upset people. The cruel irony for your character is that he thinks marriage without children is pointless. Then he has a child and learns in a most tragic way that the child is not his. What a predicament. Is the marriage worthless now? Will he love the child still? Apparently he does still love his wife.

The emotional and psychological challenge you present for your character is worthy of a Greek tragedy or a play by Shakespeare. I think the ending is perfect, because what he does isn't important. What is important is the arc his life has taken.

Very interesting story.

(I am assuming you do not intend that priest to draw a knife on the wife or child. Do you realize there is a knife hidden in the Bible?)