Government secrets? Or just another conspiracy theory.

[Munch]

Hmm, Satan/Lucifer/Iblees/Azazil is considered as a Djinn (demon?) in Islam, who had the rights to guard the gates of paradise. (which usually Angels do) 

Satan/Lucifer (The Devil) and demons are considered fallen angels in Christianity, I don't know what the Islamic belief of that is.

I don't know about Christianity or Judaism, but there are verses in the Qur'an which can be/are interpreted as an approval for extra terestrial life. (life outside of Earth)

Yes I think all religions believe in some sort of extraterrestrial life, but mainly angels, demons, ghosts/spirits and deities, but when people refer to religious people being against the idea of extraterrestrial life it's usually pointed towards their disbelief of lifeforms beyond Earth, the type of lifeforms we consider aliens when they come to Earth, not angels and demons. When saying all or most religions are totally against that idea I think that'd be classed as generalizing, but for let's say 30'/. of religious people (I'm talking about Christians now) believe that because they're not mentioned in the Bible then they don't exist.