1st. Commandment, Exodus 20:3 “Thou shalt have no other gods before me”. Old Testament punishment - Deuteronomy 17:1-5 “And hath gone and served other gods, and worshipped them, either the sun, or moon, or any of the host of heavens, which I have not commanded. Then shalt thou bring forth that man or that woman, which have committed that wicked thing and shalt stone them with stones, till they die”. Deuteronomy 13:6-10, “If thy brother, the son of thy mother, or thy son, or thy daughter, or the wife of thy bosom, or thy friend, which is of thine own soul, entice thee secretly, saying, Let us go and serve other gods, which thou hast not known, thou, nor thy fathers; Thou shalt not consent unto him, nor hearken unto him; neither shall thine eye pity him, neither shalt thou spare, neither shalt thou conceal him: But thou shalt surely kill him; thine hand shall be first upon him to put him to death, and afterwards the hand of all the people. Thou shalt stone him with stones, that he die; because he hath sought to thrust thee away from the Lord thy God." Exodus 22:20 “He that sacrificeth unto any god, save unto the Lord only, he shall be utterly destroyed”. New Testament punishment - Mark 16:16 “He that believeth not, shall be damne..Its quite clear ... There must only be one God..and if any Christian thinks otherwise will go to hell.