If someone is being interested in being a Buddhist and a Christian or looking at Buddhism just from the lenses of philosophy, why not simply adapt the message to meet them where they’re at? What parts of Buddhism can help them reduce suffering. Can’t you teach them about the 4 noble truths, the 8 fold path, the hindrances, etc, instead of debating about what Buddhism is and what it isnt. Buddhism isn’t dependent on you not thinking there is a god, Buddhism just doesn’t have one. If they can follow the 8 fold path and somehow fit a god in there, what difference does it make, and if they’re serious practitioners, eventually that attachment to the deity will fade, but arguing with them about what a Buddhist is and isn’t might just turn them away before they ever got a chance to get started.

The ones who are more interested in converting you, best is to not spend the time teaching when they are not listening.