If you witness your thoughts, you will see, even if you are a very loving person or a spiritually advanced person, that sometimes you have a thought related to God being a punishing God. This belief may or may not appear in this form. It may be thoughts related to you are not good enough or severe judgments of others, which are judgments you have about yourself and project out. When we believe we have sinned against God, and this is the central underlying belief in this consciousness, we believe that He will punish us. Inherent to this is the belief that we have separated from Him. When you feel self judgment, this arises because you believe you are separate, even though separation is impossible. We are One with Him always, eternally, since the moment of our Creation.