WHAT DO YOU FUNDAMENTALLY BELIEVE ABOUT GOD?
Everything that exists receives existence from God Who is Existence Itself. God is self-existent. A thing either is existence itself (ie God) or receives existence (everything existent that is not God). God is not moved or changed by any other being. He is not produced by any other being. He exists without the help of any other being.
WHY DO YOU KEEP CALLING GOD 'HE'?
Because when God the Second Person of the Trinity incarnated and people asked Him how to pray, He said, "pray like this: 'Our Father Who art in Heaven …." God is a spirit so He is not male or female but He wants us to call Him Father (not mother); when He incarnated He was male (ie Jesus is the 2nd Person of the Trinity); and the Holy Spirit (the 3rd Person of the Trinity) overshadowed a female (Mary) in order to conceive Jesus. We can use male or female metaphors to describe God and His attributes, but He wants us to call Him masculine names. But don't worry, outside of the Godhead, the Church that Jesus founded (the Catholic Church) names a woman (not any man) as the greatest honour of the human race.
HOW CAN YOU BE SURE GOD IS A SPIRIT?
God cannot consist of parts because the union of His parts would require a cause outside of Himself, but that is impossible because God is, by definition, the First uncaused Cause. God cannot be matter because all matter is made up of parts. We know from the order and the life of things in the universe that God is an Active and Intelligent Being. The order in the universe presupposes an Orderer; an Orderer that willed to order, such is the action of a spiritual being (a spirit is a being with intellect and will). Therefore, God is a spirit.
YOU BELIEVE NOTHING IS IMPOSSIBLE FOR GOD?
CAN GOD CREATE A 4-SIDED TRIANGLE?
All things that are possible He can do. A 4-sided triangle is a non-thing; such a figure is a mere nothing, a contradiction in terms.
* 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.