As with any spiritual practice, it is important to define your intent, set your goal and prepare your ritual space with the appropriate tools and equipment. Religious practices all over the world call upon a deity of spiritual being of some type or name to assist in the practice or ritual at hand. Buddha, Jesus, God and Archangels are often thought of as the most common examples of spiritual deities. From a New Age Metaphysical perspective, a practioner may also attempt to contact an animal guide or spirit guide to help add a measure of concentration and energy to the work being performed.
Many traditions within the religion of Witchcraft are no different from these other forms of practice. An alternate definition of "spiritual deity" might be thought of, but basically the concepts are the same. One of the common principals of Witchcraft is the definition of the God/Goddess. That which is "God" is the masculine essence of divine energy or the divine forces, or the all that is; pick a label you prefer. That which is "Goddess" is thereby the feminine essence of the same divine energy or force. But even amongst Witchcraft practioners, this definition exists with many others.
No one can truly answer the question "Which God is God?" This philosophical question is as old as the dawn of time .