How many books other than the Bible has God given us that we understand his existence?

The Bible is the central text of Christianity and is the primary source of our knowledge about God and his existence. However, there are many other books and writings that have been written throughout history that provide insight into the nature of God and his relationship with humanity.

One of the most famous of these books is The Confessions by St. Augustine. In this book, Augustine recounts his journey towards Christianity and his understanding of God. He writes about the nature of sin, the importance of faith, and the role of free will in our relationship with God.

Another important book is The Imitation of Christ by Thomas à Kempis. This book is a classic of Christian devotional literature and speaks to the importance of humility, self-denial, and obedience to God. It is a powerful reminder of the importance of focusing on God rather than on the things of this world.

Other important books include The Pilgrim's Progress by John Bunyan, which is a classic allegory of the Christian life, and The Screwtape Letters by C.S. Lewis, which is a satirical look at the nature of temptation and sin.

While these books are not considered to be on the same level as the Bible in terms of their authority or inspiration, they do provide valuable insights into the nature of God and his relationship with humanity. They are a testament to the enduring power of the Christian faith and a reminder of the many ways in which God has revealed himself to us throughout history.