Drawing a line

At what point do we as believers need to draw the line on who our friends are, and how different their beliefs are then our personal beliefs. My personal opinion is its okay to have non-believing friends, as long as they are not going to make us lose our faith or we won’t fall into what we believe is sin. I have many different types of friends, and most of my friends know what they can say and do around me and what they better save for when they are not around me. Friends are hard to find especially those friends you can count on when times get bad. I have a few friends even though I can not see them or get to talk to them often I still know they are there just like I know the wind is there by watching a
garden windmills. If a friend isn’t a believer but they are healthy to be around they are a good friend.
I was asked the other day a question. My outlook was nothing is evil if it’s a item unless it causes you to invite evil into your life. Like a mirror isn’t bad, its something to help you do your hair or makeup or what have you. The mirror would become a problem if a person felt the need to sit there and indulge in the mirror. Reading books I don’t care what people read, now if the book is inviting evil in I might recommend not reading it, but if it a book that entertaining its okay even if its wrote by a secular author. I have read many books that aren’t Christian and frankly I doubt there are enough Christian or other religious books that would keep me interested.