According to modern atheists, God is no more than a projection that man makes of himself, as one who confuses with another person his own image reflected in a stream. This might be true in regard to any other idea of God, but not in regard to the Christian God. What need would man have to divide himself in three persons: Father, Son and Holy Spirit, if God is really no more than the projection that man makes of his own image? The doctrine of the Trinity is, on its own, the best antidote to modern atheism.
Do you find all this too difficult? Have you understood little? I will tell you not to worry. When one is on the shore of a lake or a sea, and wishes to know what is on the other side, what is most important is not to sharpen one's sight and try to scan the horizon, but to get into the boat that takes one to that shore.
With the Trinity, what is most important is not to ruminate on the mystery, but to remain in the faith of the Church, which is the boat that takes one to the Trinity.
Fr. Raniero Cantalamessa