I would claim there is nothing in religion which is deplorable and essential-- hence no final reason for anyone to reject it.
What it provides is a basis for idealism, and for always looking for the Bigger Picture. It contributes to one's own happiness, by minimising the impact of private griefs-- not by saying they will all be fixed in Heaven, but by calling attention to the fact that the world is still beautiful and others have immense happiness while I myself have grief.
It does not require superstition or tribalism. As far back as the oldest bits of the Old Testament, the Jews were required to treat with kindness the "stranger within their gates". It does not compete with science on science's terms. The phenomena of religion will eventually get a scientfic explanation. Religion and science share the obligation not to make out that one knows when one doesn't.
Some people find the whole idea of worship unwelcome; but they too can spend an hour with others open-mindedly trying to see what it is that matters most-- and this is worship. And the stories of religion, while one has to treat them with caution, amount to a source of inspiration and rejoicing.