Is God Made Up?
BUT WHAT IF OUR BELIEF IN GOD IS JUST ALL IN THE MIND?
You can provide no evidence that God is "only in the mind". We have to just take your word for it; whereas, there is plenty evidence to the contrary. Logical proofs for God's existence abound. For example, the proof for God's existence from the design in the universe comes from observable, tangible, material, concrete, and scientifically verifiable evidence; all of which exists outside the mind. A case is established by reasons for, and not by the absence of reasons against. Conclusions can be drawn only from positive reasons that are identifiable. Since there are no positive indications for believing God is only in the mind, the absence of reasons supporting such a claim is reason enough to question its validity. It is a contradiction to hold that God is only in the mind but to accept and believe in the existence of all other abstract, non-material realities such as imagination, courage, justice, love etc. Our will is imperceptible to the senses and yet it can work on the muscles of our body causing movement in our limbs. It is contradictory to accept the existence of the will (and all other spiritual, non-material realities) and yet deny the existence of the one supreme spiritual reality (ie God). So, our belief in God cannot just be "all in the mind". If reality was really just all in the mind we could change it by thinking but we can't. If you believe the door is not there and you walk through it without opening it you'll bump your head! Reality exists outside of ourselves too, so also does God. God isn't just in the mind; He exists outside of our mind too. We exist, therefore we think, not vice versa.
PROVE THE SPIRITUALITY OF THE HUMAN SOUL.
Human beings can study the visible world and, from sensible experiences of material objects or events, can create purely immaterial realities called ideas. Immaterial ideas imply an immaterial faculty capable of forming them. It is impossible for something material to create something immaterial. Therefore, the faculty capable of forming spiritual ideas must itself be spiritual. This spiritual faculty can only come from a spiritual substance, the soul. If you doubt this, simply form any abstract idea in your mind and ask yourself: "How much does it weigh? How long is it? What colour is it? What shape is it? How much space does it take up? The answer, of course, is that your idea has no weight, no length, no colour, no shape, and takes up no space. It simply has no material attributes at all. Something with no material attributes is immaterial, another word for spiritual.
* Please note that this text should be read in the context of the whole work and in recognition of the appropriate paragraphs of the Catechism of the Catholic Church highlighted in the index.