The ET issue is irrelevent
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That would depend on a lot of factors.
Folks deluded into hell because they were not properly warned would likely disagree with you.
People will not be saved by the knowledge that ETs are demonic, if such turns out to be the case. People will be protected from them ONLY by the Blood of Christ! Demon ETs pose no more risk to the SAVED soul that plain old ordinary run of the mill demons. The point I am trying to make is that calling ones attention to the dangers is not even slightly effective. Providing the Shield and the Cure is the only way to save souls. Under that Divine Protection, it makes no difference in what form the danger appears. Given that as fact we can agree upon, wouldn't it make more sense just to spend one's time just witnessing for Jesus and seeding the Holy Spirit? God will protect us from anything evil, even if it is invisible and totally unknown to us. So, skip the details and pass out the Ammunition!
Tactically speaking, Satan can turn any situation to his own favor merely using the unknown, even it that unknown is itself relatively harmless. Case in point: You spend a lot of time with this when you could be spending an equal amount of energy with plain old evangelism. How are you so sure that Satan hasn't turned you from the mission that Christ commanded us to perform through this ET sideshow? After all, you are guaranteed to have the direct help of the Holy Spirit whenever you speak of Salvation through Grace in Christ. The Bible makes no such guarantees for any other endeavor.
From this, I view the ET situation to be merely interesting. I would be stunned if you tell me that I did't communicate at least this time.
Of course, I understand that the pre-Lutheran Catholics were'nt really happy with this Salvation through Grace stuff. One had to gain entry into heaven through the priests, assuming the proper level of payola. Has the Catholic Church maintained this gem of doctrinal stability through the centuries?