Yes, in fact it's one of the core beliefs of Christianity. Christians believe that the Doppelganger phenomenon is a sign from God, meaning that the sky will soon turn a sunset colour and darkness will fall across the earth for a period of time. This contrasts to the views of normal people, who also don't believe in any imaginary friends like "God".
Doppelganger is a German term that means double goer and is a paranormal double of a person. As well as this it can mean having the feeling of seeing oneself but not in a mirror or reflection. Some people believe that a doppelganger can be the ghost of a person.
Everyone can have a doppelganger.
You don't become a doppelganger, doppelganger exists by God.
Christians do not believe in reincarnation. Christians believe in Heaven.
I saw my doppelganger across the street, and it was like looking into a mirror.
Doppelganger Inc. is no longer existing.
It's because your doppelganger can pretend to be you or she might be standing right behind you when that person saw your doppelganger.
Christians believe there is only one God.
Christians believe that 'life starts' at conception.
I would consider the antagonist as the creature he is. Not who he is but what he is, a Doppelganger.
Doppelganger - 1997 is rated/received certificates of: UK:PG
Christians believe that the Messiah Has Come. Jews believe that He Has not.