What Jesus Christ Had to Say About the Outsider Test for Faith!

This is my chosen title for a guest sermon I'll be preaching for the "One True Church of Jesus Christ That Has Ever Existed in History." The preacher is away on vacation. This church meets in a little building on "Faith" Street in a town called Saint Paul, Missouri, the "Show Me" state (never-mind the oxymoron). They have a membership of 10 people, all related to each other in some way. Here are my chosen texts. How should I develop my sermon?

Matthew 7:1-12
“Do not judge, or you too will be judged. For in the same way you judge others, you will be judged, and with the measure you use, it will be measured to you. “Why do you look at the speck of sawdust in your brother’s eye and pay no attention to the plank in your own eye? How can you say to your brother, ‘Let me take the speck out of your eye,’ when all the time there is a plank in your own eye? You hypocrite, first take the plank out of your own eye, and then you will see clearly to remove the speck from your brother’s eye...So in everything, do to others what you would have them do to you, for this sums up the Law and the Prophets.
And then this one from Matthew 23:
“Woe to you, teachers of the law and Pharisees, you hypocrites!...“Woe to you, blind guides!...You blind fools!...You blind men!"...“Woe to you, teachers of the law and Pharisees, you hypocrites!...You blind guides! You strain out a gnat but swallow a camel"...“Woe to you, teachers of the law and Pharisees, you hypocrites! You are like whitewashed tombs, which look beautiful on the outside but on the inside are full of the bones of the dead and everything unclean. In the same way, on the outside you appear to people as righteous but on the inside you are full of hypocrisy and wickedness. “Woe to you, teachers of the law and Pharisees, you hypocrites! You build tombs for the prophets and decorate the graves of the righteous. And you say, ‘If we had lived in the days of our ancestors, we would not have taken part with them in shedding the blood of the prophets.’...“You snakes! You brood of vipers!