A Believer's Relationship with the World
The world - not the literal planet we live on, but the world system - has nothing of substance or value to offer anyone. At best, the influence of the world causes a person to be indifferent towards God. At worst, the influence of this world will cause a person to hate God and anything that reminds the person of God.
As a believer, you are not intended to blend into the world, or to befriend the world, or to imitate the world, or to love the world. You are intended to overcome this system and philosophy called "the world".
1 John 5:4 "For whatsoever is born of God overcometh the world: and this is the victory that overcometh the world, even our faith."
You certainly won't make (m)any friends - among believers and unbelievers alike - if you decide to become separate from this world in any way. You'll be looked upon as weird, different, and perhaps even dangerous. Very few people can understand a person who isn't in love with this world. So if you are persecuted (or even prosecuted) for your efforts to live peacefully but separately from this world's ways, don't be surprised.
1 John 3:13 "Marvel not, my brethren, if the world hate you."
Gaining people's approval shouldn't be your prime goal in this life. It shouldn't even be in your top ten list of achievements. What does it matter if people pat you on the back? Did the authorities, the rich men, and the leaders of Jerusalem pat Jesus on the back? No, they put him in prison, tortured him, and killed him. All because, basically, He spoke the truth. Don't think the authorities of today would do any less to you, and for less. This world will not love you, ever. And you shouldn't fall in love with it.
1 John 2:15 "Love not the world, neither the things that are in the world. If any man love the world, the love of the Father is not in him. For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world."
So, what should a believer's relationship with the world be? It should be very simple: that of an ambassador (2 Cor. 5:18-19). A believer is a witness. A believer is a light. A believer is merely a traveler, passing through (Heb. 11:3).
2 Corinthians 6:14 "Be ye not unequally yoked together with unbelievers: for what fellowship hath righteousness with unrighteousness? and what communion hath light with darkness?"