The Bible has many verses about money and earthliness. Any Christian who doubts this needs to read his or her Bible. The spirit of mammon literally works through all earthly things, and everyone who is unsaved is under the spirit of mammon. I will present a Biblical case for this as below:
You are either For Jesus or Against Jesus
Jesus said that, "He that is not with me is against me; and he that gathereth not with me scattereth abroad" (Matthew 12:30). There are only two types of people in the world: those who are for Christ, and those who are against Christ. There is no middle ground. A person either hates Christ, or loves Christ. A person cannot be neutral about God or Jesus. Anyone who does not confess to love Jesus hates Him. Anyone who denies His Word hates Him. Anyone who twists His Word hates Him. There is no grey area regarding following Jesus.