The thing that causes Christians to stand out from the world is not merely our accuracy. Believers are right about God’s existence and about salvation in God’s Son alone, but there is more to our identity than identifying (and departing from) error. Unbelievers are in a state of spiritual blindness, their minds are darkened, but the primary dividing line between us is not merely true and false.
The primary difference is that we are with God. We know the truth, but that is not an abstraction; Jesus said He is the truth (John 14:6). God is light (1 John 1:5), there is no darkness in Him at all (1 John 1:7), and when we walk in the light we have fellowship with Him. When God saves us, He does more than enable us to answer more theology questions correctly.
See what kind of love the Father has given to us, that we should be called children of God; and so we are. The reason why the world does know know us is that it did not know him. Beloved, we are God’s children now, and what we will be has not yet appeared; but we know that when he appears we will be like him, because we shall see him as he is. And everyone who thus hopes in him purifies himself as he is pure. (1 John 3:1-3)
In these few verses we understand why we are out of step with the world, we understand the importance of worship, and we understand the goal of our confession.
We become like who (or what) we behold, and as we behold God, we take on His shape. As children we see our Father and we grow up to be like Him. At the appointed time, our godliness will be glorified, and that is more than fastidious factuality.
Even now we grow in the process. We hunger and thirst for righteousness because that is what our Father is like. He is pure, holy. When He calls us to confess our sins it is not primarily to enforce His power of us, it is not ultimately to get us to agree with Him what we are wrong, it is so that He might share His own likeness with us. “He disciplines us for our good, that we may share his holiness” (Hebrews 12:10).