Everyone is on a journey of faith.
Everyone has belief in something, even if that something is “nothing.”
As God’s agents, we must ask questions to discover where on the journey people are. We do this by building relationships with people and explicitly, at least, avoid topics of faith. When a person is in relationship with us they are in relationship with Christ as we continue to follow him as his disciples.
Through the relationships that we facilitate when can then encourage people to take steps forward. Those steps may be long and laborious, but taken in stide a person may eventually come to a point where they are willing to make a full and dynamic commitment to follow Christ along with you… which is something that they have been doing implicitly anyway as they follow you who continue to follow Christ.