I do not have a lack of understanding, I have responded to each of your question in kind. You keep missing the point, why do you have to be at a nightclub, why not at a local cafe, on the street or what ever. You breath in some toxic chemical that has no smell or taste. How are you going to know that (and it doesn't even have to be God) that you saw something that wasn't real. What if it was a friend in High School that you haven't seen in years, an old girlfriend or what ever. Would believing in aliens be irrational? Would believing that the universe as we know it is only an atom in a giants fingernail be irrational? How about believing in RODS? It is how you came to this decision and what knowledge that you used and had to make this decision that will make it irrational and not the choice it self.
Despite the fact that you're wandering into the realms of the extremely unlikely (I don't know of any occurence of someone sitting at a cafe and breathing in a hallucinigen), even if you did see an old high school friend, the difference is at least you know that person exists so at least there is some basis for the belief that what you saw was real. Seeing God, on the other hand, is a nonsense.
Unless you want to complicate things further by saying "what if you saw your old school friend and he/she told you that he/she was God?"
But we've wandered off the point somewhat. My point is that believing you saw God for real as opposed to thinking that you've been the victim of a drug spiking is irrational because there is proof the the latter happens and there is no evidence that the former does.
Believing that aliens may exist, from a statistical standpoint, isn't irrational. Believing that the universe is an atom under a giant's fingernail is irrational because a rational decision is based on things can be shown to be true. God cannot.
Fair enough, once you've eliminated all the other possibilities for your "experience" then you're free to believe what you want but it still doesn't make that belief rational. Jumping to that conclusion right from the off is also....irrational and illogical.
You also assume that the person effected would also know about drugs and the human condition that could cause them to see things, what if this person is not aware of these things?
If a person isn't aware that drugs exist in the world then that person is extremely likely to be incapable of rational decision making.
Was is it irrational to believe in God 1,000 years ago? How about 900, 800, 700 and so on? At what point in time did believing that God created everything become irrational thinking? When the theory of the Big Bang was created? So at that point if you believed in God you were irrational because there was a theory of how the universe was created other than God but before that you were OK?
No because there still was no evidence that God was real. Belief on the basis of nothing is irrational.
Irrational is the lack of understanding and in order to understand something you must know about it. Try explaining the speed of light to someone that doesn't understand science, or try and explain infinite mass to that same person. Both of these things would be far out concepts that do not follow their understanding of the world and would seem irrational to believe in them.
Both of these things can be shown to be based in the laws of physics. Understanding or lack of does not effect their veracity.
I think we're not going to convince each other either way though.