That God exists as a being with power and personality. That he has a specific location in heaven with the angels his messengers. That he is the creator of the heavens, the earth, and all life on the earth including humankind. That he is the father of Jesus Christ and that he has a purpose for his Son to reign on earth at a time yet future.
God is all powerful, he does not share his power with any sinful being who is opposed to his ways. (Satan is a term which refers to 'adversary' or 'an enemy' and can refer to good and bad people, figuratively, the terms the devil and satan can refer to sin and the flesh).