How Should Christians Relate With Unbelievers?

How should we relate with the unbelievers.
The unbelievers are those who practice other religions aside Christainity and those who don't believe in Jesus Christ and God. It best we relate cautiously and firmly with the unbelievers so we don't get confused or convinced in sinning against God or engaging in unholy acts.

How best should we relate with the unbelievers in our working places / places we find ourselves in ?

source http://www.nairaland.com/6271451/christians-how-should-relate-unbelievers