Yes, its nothing spooky, The invisible world with spirts, demons etc does exist, just as The Holy Spirit, The Father, Jesus exist, of course we as Catholics know as well as Christians know that Jesus is everywhere through the abiding presence of the Holy Spirit, it is all one, the triune Godhead, as there are demons, imps and all kinds of horrible torturous spirits that I believe from study are why people who killed a lot of women, children, Hilter, were hearing these invisible spirits which are evil, This is why we have crime, drugs, abortion, infanicide, euthenasia, hate crimes, and a multitude of evil in our World.
Jesus was sent by the Father from Heaven and for the purpose of giving us Eternal Life, our free wills do have a gigantic part in that and God will not force himself on anyone, we have a free moral agency as people to accept or reject. Forgive any spelling errors my spell check is off since my Chrome Browser crashed last evening and I am hoping I will get it fixed soon, til then relying on this internet explorer 9 to keep me where I can write. I hope this adequtely answered the ? Those spirits will attack you in any way fathomable to prevent you from accepting Christ if you have not accepted him, asking Jesus to help even in a whisper always gives a way of escape...out of love of course.