[quote="scameter18, post:1, topic:289529"]
I have seen many Christians, including many Catholics, state that it is immoral in some circumstances to be around those who we know to be sinning. For example, if one's son or daughter is living with their boyfriend/girlfriend, we are not supposed to spend the night with them while knowing they are living in an illicit arrangement. Would their sin cause us to sin if we are close to it in this way? Why would us just being around a sin cause us to sin as well? Is it not possible to be around those who we know to be sinning while avoiding sin ourselves? Or does this only apply in some situations?
I think the issue has nothing to do with "catching the sin" like catching a cold. It is more a matter of being light to the world and ensuring that we do not condone that which we know is against God's will for us. Also, we should not create scandal. Non-Christians looking at our actions, should be able to tell we are Christians. IF they can't tell we are different, why would they want to investigate Christianity. From an outsider looking in perspective: if it doesn't make a difference in the life of Christians, why bother. They should look at us and see Jesus reflected through our actions and words.
Some people take this too far by the way and actually drive those they love further away, rather then help them see the mistakes they have made. We are called to educate in charity