It's hard to tell the difference between Christians and unbelievers today, because there's hardly any difference. Is there anything we do that they don't do? As one author put it, the church has become worldly and the world has become "churchy". I think the root of this is friendship with the world.
Bad company corrupts good manners. Friendship is influence. The more friends a man has that don't take doing God's word seriously, the more worldly he becomes. Satan understands the power of friendship and he's using it to get the hearts of believers, especially the youth.
David said, "I am a friend to all who fear you, to all who follow your precepts." Psalm 119:63. You should have friends with whom you deepen your relationship with God. You should have friends who call you when they don't see your in church and other meeting and programmes. You should have friends who can say, "Have you read so and so book or portion of the Bible, mind sharing?" You should have friends with whom you can pray. Iron sharpens iron.
Make true friends. Proverbs 12:26 says, "The righteous choose their friends carefully." Just because a person is always around you at work, at home or in school doesn't qualify him or her for friendship. True friends are those with whom you can truly serve God with.