What Would You Say to a Christian?

We're called to, like, allow god to change our hearts, righte? So even if the person doesn't respond, well, if you've done what you an do, so far as it depends on you, live at peace with everyone. And just like, do pray a lot. What would you say to someone who's going home to family members who don't know jesus and they've changed? "Slovenly should act like sinners. Pagans should act like pagans. Non believers should act non believers"