Even if theism is a failure, it's still superior to atheism

[Mister Agenda]

My complaint about Christians is not that they exist but that so few follow the advice supposedly given by Jesus concerning witnessing: to be as gentle as a dove, wise as a serpent, and if they won't listen to you, shake the dust off your feet and move on. We've all heard the 'good news', Christianity has reached market saturation. Now is the time to consider our position, and your position, very carefully to make sure you understand us and that you can offer some words likely to be effective. Praying about it might help.

Lol is he obligated to do that?

If they don't feel an obligation to follow the advice of Jesus, there's only a faint hope that they will feel obligated to follow my advice to follow the advice of Jesus.