True Christianity is Always the Activity of God

In 1 John 5:1 it teaches us that the believer believes because they've first been born of God. This shows us that the new birth is responsible for faith; not faith being responsible for the new birth. True Christianity is always the activity of God and our faith is a reaction to God's initial call. Why does this matter so much? It is because we want a church that is God's work and not something manufactured by man.