Christians and paranormal Fiction and others

 I am a very devout person, and I was raised with very spiritual convictions.  I try to be accepting if my other Christian authors/friends' faith are weak.  The Apostle Paul wrote that we should accept him whose faith is weak. Is it my place to tell them "A Christian should not write certain fiction?" Do I have  convincing proof that writing books about alien beings is not right for Christians to write? Or that writing about witches and vampires is also wrong? No, I don't. It is between them and God. If they have no convictions about what they write then is it my place to make it clear to them? No, but does it mean I have to agree with their reasoning? No.
However, it doesn't mean these creatures and beings don't exist. Take for example ghosts. I for once thought that only the Holy Ghost exists until I read a verse in the Bible where the disciples thought Jesus was a ghost.  As for witches, yes there were witches in the Bible but God told people that they were not suppose to have anything to do with the occult (Witchcraft, sorcery, etc. is the occult) In the Harry Potter Series, Harry and his cohorts are all witches. Yes, you may say it is good versus evil but there is no such thing as good witches. Witchcraft is wrong! Writing about the use of witchcraft is almost like glorifying it. The more you write about it or talk about, the more the devil loves to hear! But what if you write about a Christian who falls in love with a warlock or a witch? The warlock or witch does not tell the Christian who or what they are, but they seem to have some power over them until the Christian realizes that any curse the other person puts on them can not work.  In the book of Numbers, Balak asked Balaam to put a curse on God's people, but he could not. He said, "How can I curse what God has blessed?" This had given me an idea to try a paranormal romance!
Another kind of fiction I think is strange for Christians to write are Vampire Fictions! How is that a Christian can become a victim of a vampire if she is blessed? Unless however that Christian is not aware of that. It is not my place to judge. Perhaps God has allowed his people to write such stories. I would like to try paranormal romance sometime  if God allows me too. We shall see.  By the way, some readers may consider reading HP Series a fantasy but we are not suppose ot chase after fanstasies.