we believe in god so in same manner does we believe devils to?

Answer 1

It would be impossible to believe in God without believing in satan as well.
The Bible is not just a book about God but also about sin/satan/devil
and what to do to overcome him in the spiritual battle.
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Biblical references of satan/devil

http://www.phrases.org.uk/meanings/151300.html
The reply of Jesus when tempted by the Devil.

Origin

Luke 4:5-8 (King James Version):

4:5 And the devil, taking him up into an high mountain, shewed unto him all the kingdoms of the world in a moment of time.

4:6 And the devil said unto him, All this power will I give thee, and the glory of them: for that is delivered unto me; and to whomsoever I will I give it.

4:7 If thou therefore wilt worship me, all shall be thine.

4:8 And Jesus answered and said unto him, Get thee behind me, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.

The Bible also records, in the Matthew and Mark gospels, how Jesus rebuked Peter with the same words at his suggestion that Jesus would not be raised from the dead.

Matthew 16:23. But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offense unto me: for thou savourest not the things that be of God, but those that be of men.

Mark 8:33. But when he had turned about and looked on his disciples, he rebuked Peter, saying, Get thee behind me, Satan: for thou savourest not the things that be of God, but the things that be of men.

I hope this is what you are searching for.

Answer 2

I guess you can't believe in one without the other. We need to understand that the devil is necessary in life. I don't mean that like I'm a devil worshiper but just to say one can't exist without the other.

Answer 3

no not at all god is one and creater of us that is logical but devil that are senstional or situational creted by man or by their heart and has no logic behind that