Dictionary definition of religion:

The beliefs, attidues, emotions, and behaviors constituting a person's relationship with the powers and principles of the universe, especially with a deity or deities.  And the practical results of such a belief are expressed in worship, ritual, a particular view of the world and the nature of destiny of humanity.

K.U.L.P.

Know your audience

Paul knew his audience when presenting the gospel.

Use their language

Paul used Greek poets to explain the gospel.

Live grace

You can't earn salvation. 

Present Jesus

You are not going to convience and force people to believe.  Present Jesus and get out of the way.

The object of your faith is what matters.