This book theme and content is derived directly from the Holy Bible which is the only source of The Truth directly from God to His human children. The original texts of the Book which God wrote are perfect, and contain exactly what He intended for us to learn about Him. They were not written by men, but copied down as God directed by inspiring his disciples and and prophets to write each word.
Thousands of scholarly theologians have widely differing views about what the Bible teaches. How can that be? All religions are human ideas about God. 'Churchianity' is in doctrinal chaos. The information in this book is not drawn from any religious ideas.
In this era, God is calling the "few" individually to come out of this 'world' and its organisations, and have a personal relationship with Him directly through the Power of His Holy Spirit. Each person who God chooses to open their mind, can ask for the spiritual gifts of belief, knowledge, wisdom, and understanding. "You need not that any many teach you: " All you need is a Bible, and to ask God for a lot of help from Him.