Hi ya since I really don't know any one on a personal level, its kind of hard, to tell at first , what a person truly believes online, ok now on the atheist I'll talk to him, first try to get to know him, most people are not interested in how much you know. but how much you care, while I'm talking to him I'M also praying, listening to the holy spirit telling me if his heart is open or not, talking to people about Jesus, is a heart thing, not a mind thing, we must be sensitive to the holy spirit to reach them, me own my own strength, I cant do anything, ok now about the aliens demonds, no I 'm not afraid of no spirits or alians, and if some one is trying to prove that Jesus did'nt exist , then I would share with them my testimony. the kind of person I was before I give him my life, how he changed me, and year after year. how God, was there with me, in the bad times and the good times, and if they still wont or act like they, dont beleave you, then, dont worry, because, by you, talking to them about Jesus, your planted a seed, then the holy spirit will convict of sin. and later on they 'll come around,