Don't you reckon that's God's decision?
Actually, we should be trying to get them there, and keep 'em there long enough, or coming back often enough, for the Lord to help them overcome those things, if that's his will, and their desire.
Y'know, even if they think they have no intention of changing, the exposure to those who have would probably be good for them.
I don't believe the departure point is important on this journey. It's method of transportation and the arrival at the destination that counts.
"Believe, and you shall be saved!"
Nothing else matters, or in the words of some long forgotten oracle: "All else is vanity".
Bring 'em on in. Maybe, by example, and with His help, we can show them a better way.