From the beginning Christianity has been a proclamation, not a thesis supported by various logical arguments. The apostles called for commitment to Christ by preaching the gospel of sin, righteousness and judgment (Jn. 16:8-11). When that emphasis has been diluted or abandoned, as it has to a very large extent today, the glory of the Lord has departed, the power of the church has been weakened, and belief in God has faded away.
Gerald Bray in The Doctrine of God
I would add something, but I think this speaks for itself.