This Bible contradiction is from the Skeptic's Annotated Bible.
1 John 4:2 View context
Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:
1 John 4:15 View context
Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God.
1 John 5:1 View context
Whosoever believeth that Jesus is the Christ is born of God: and every one that loveth him that begat loveth him also that is begotten of him.
No, some are devils.
Mark 1:23-24 View context
And there was in their synagogue a man with an unclean spirit; and he cried out,
Saying, Let [us] alone; what have we to do with thee, thou Jesus of Nazareth? art thou come to destroy us? I know thee who thou art, the Holy One of God.
Mark 3:11 View context
And unclean spirits, when they saw him, fell down before him, and cried, saying, Thou art the Son of God.
Mark 5:2-7 View context
And when he was come out of the ship, immediately there met him out of the tombs a man with an unclean spirit,
Who had [his] dwelling among the tombs; and no man could bind him, no, not with chains:
Because that he had been often bound with fetters and chains, and the chains had been plucked asunder by him, and the fetters broken in pieces: neither could any [man] tame him.
And always, night and day, he was in the mountains, and in the tombs, crying, and cutting himself with stones.
But when he saw Jesus afar off, he ran and worshipped him,
And cried with a loud voice, and said, What have I to do with thee, Jesus, [thou] Son of the most high God? I adjure thee by God, that thou torment me not.
James 2:19 View context
Thou believest that there is one God; thou doest well: the devils also believe, and tremble.