The opening of lesson two mentions, "...it isn't so much if we believe in God as it is what kind of God we believe in. "I think this is so true. We sometimes have a erroneous concept of God. Sometimes what we have been thought isn't the best healthy way of thinking about God, ourselves, relationships and the world at large.
We at one time or another have had some type of illusion concerning God, life and our relationship with others.
We are true sons, daughters of the same Creator, of the same Spiritual Father/Mother. If and when we understand this we will live differently. We will live fully, to the greatest degree of love and understanding.