Bro Kennyandry,
Once you state things like this, there's no point defending it from those who strike your view. You'd go in circles, and you won't change anyone else's point of view.
Why? For the most part many would think otherwise from what you have concluded. As I've learned online, evidences are always neutral. That is, presented with the same 'evidence,' people will conclude differently, because we are guided by our respective worldviews. Just preview the comments, you see what I mean. The evidences presented in the videos as well (can't view them--office controls) are 'exposed' by those who think illuminati exists, and are thus presented as proofs. To others who think it's crackpot conspiracy, those satanic gestures are merely that--gestures.
Therein lies your second problem. To use the illuminati scare does more damage than good, IMO, to the Christian witness/voice. Christianity is already viewed with so much suspicion, to use this what many consider a stupid conspiracy theory solidifies the perception that we Christians haven't gotten far from the medieval, superstitious mindset. Remember the pastor who went on tv with the backmasking thing? He was discounted as a mere overnight fame seeker. I don't know his intentions, but his move might have greatly ruined his reputation and worse, his witness.
Just state your point, and that's it. Focus more on the proper and pure testifying of the Gospel of Christ. You'd still be ridiculed and be dismissed as a fool, but at least you're faithful to the steps of the witnesses who "turned the world upside down." The Gospel is the power of God to save, not on the exposing of false teachers/messengers. You can expose, yes, but it is with the Gospel that God will change or enlighten those who are being deceived. Remember, many of the deceived desired the things that deceived them--their ears itched for it.
And also, let's not forget the 'evidence' of the Gospel in our lives as well.