2 Corinthians 13:5 (ESV) "Examine yourselves, to see whether you are in the faith. Test yourselves. Or do you not realize this about yourselves, that Jesus Christ is in you?—unless indeed you fail to meet the test!"
Drawing from Jonathan Edwards on True Christianity by Owen Strachan and Doug Sweeney, Trevin Wax offers these seven questions for examining one's claim to be a Christian.
1. Do you love God?
2. Do you love the Bible?
3. Do you love living out and sharing the Gospel?
4. Do you love Christians?
5. Do you enjoy church and draw nourishment from it?
6. Does the matter of eternity concern you?
7. Does the Bible shape your morals and ethics?
For an expansion of these questions, check out Kingdom People.