Q. What makes Christians different from other people?

Actually, Christians aren't all that different.  True Christianity is radically different from religion.  Religion basically teaches that a person makes themselves acceptable to God through their obedience.  That results in a division between the righteous who have justified themselves and the rest of the world that was unable to pull itself up by its bootstraps. 

Christianity, however, teaches something totally different.  The Bible teaches that all of humankind have failed in the ultimate sense because of our sin of valuing things above God. Unlike religion, Christianity removes any basis for judgmentality and self-righteousness.

What then makes Christians different?  They're forgiven.  They've trusted Jesus to save them and repented of trusting in themselves.  They've trusted Jesus to satisfy them, and repented of trusting other things.  A Christian still sins - often - but that sin is now accompanied by repentance.

A Christian is given new desires.  God is no longer boring but glorious, no longer someone to run from and disobey but someone to run to and trust and find satisfaction in.  Christians are given new love for God and the things of God - they love to hear about him and what he has done and how he has worked in the lives of other people.  They love to see God's power and beauty.  And they love people, and love it when other people meet and experience God in the same ways they have.  They love to serve people, like Jesus did, treating others as better than themselves.