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Aliens on earth? Yes, the idea is demonic. The concept that somewhere in the giant universe we live in that God may have created another race? That's not demonic. The context of the question was their existence, not them coming to earth.
The bible not mentioning something does not mean it is not in existence. It May only mean that God saw no purpose in telling us. Realistically it's not a very valid or feasible belief that God has shared all He has done in eternity. He shared with humans what was relevant to humanity. If God has created other life somewhere in the universe, then it has no bearing on our current existence and therefore has no purpose in being mentioned to us. It is neither biblical nor unbiblical to believe that they do, or do not, exist. Only once you begin having a belief that they are vising us do i feel the concept becomes evil.
The bible not mentioning something does not mean it is not in existence. It May only mean that God saw no purpose in telling us. Realistically it's not a very valid or feasible belief that God has shared all He has done in eternity. He shared with humans what was relevant to humanity. If God has created other life somewhere in the universe, then it has no bearing on our current existence and therefore has no purpose in being mentioned to us. It is neither biblical nor unbiblical to believe that they do, or do not, exist. Only once you begin having a belief that they are vising us do i feel the concept becomes evil.