There is an explanation, however, that CAN be given for why he claims to know a god that might not r doesn't exist (see below).
Perhaps there is no proof or even good evidence that a god exists because no god exists. Here's the problem with faith. It allows one to hold those same conclusions without sufficient evidence to conclude that they are not incorrect.
Once they develop critical thinking skills if they ever do, people will often stop believing the Bible. This is why your Bible calls knowledge foolishness and holding faith-beliefs wisdom. This is why the church wants to get to children young, in their schools where children never taught religion and never brought to church can be found, before they can develop such skills, and why some denominations discourage college. Critical thinking is kryptonite to faith-based thought. There is no place for faith in reason. It generates a non sequitur fallacy and an unsound conclusion every time.
I don't believe that you had asthma severe enough to hospitalize you that was instantly reversed. I'm assuming that you mean admitted as an inpatient for treatment of severe, life-threatening asthma treated with intravenous bronchodilators like aminophylline and not just observed in an ER or getting only medicated mist inhalation therapy. Such a person will remit quickly with minimal intervention at times with or without prayers, but not somebody with severe respiratory distress and significantly reduced blood oxygen levels.
I'm very experienced treating asthma including in ICUs using mechanical ventilators. Nobody goes from that sick to well instantly as you described.
That's description enough. What you are describing is a spiritual experience, which has nothing to do with experiencing spirits. There is no evidence that this is more than one experiencing his own mind. There are a variety of experiences that can result in some combination of a sense of connection and belonging, of mystery, of awe, and/or of gratitude. These can range from moving aesthetic experiences like rapturous music to a beautiful sunset to mindful gardening to informed stargazing to taking psychedelics to becoming a mother or rescuing an animal.
There is a temptation to conclude that one is experiencing a god, hence tripping people describe seeing the face of God just like you did, possibly from hypoxemia in your case. And that's how I understand your description of your spiritual experience. Sure, maybe you experienced a deity, but maybe you just misinterpreted your own mind and misunderstood the experience it generated as experiencing an intelligent, loving agency. And since you cannot know which of those it is, you cannot know that a god exists, but you CAN believe that you know that.
The mind also tells us what it finds beautiful, valuable, funny, and more. These, too, are endogenously arising mental states in response to various experiences. We don't mistake them as being qualities intrinsic to that being experienced. We understand them as subjective assessments generated by unseen neural circuitry.
The spiritual experience can be understood the same way. One is attaching significance to an experience that might have little or no significance to another mind. One stargazer understands the immense distances a drop of starlight has travelled to impact his retina and announce its existence to him, as well as the fact that we are stardust forged in the belly of such monstrously huge and hot infernos, and experience a frisson in his spine as he feels a sense of connection, mystery, awe, and gratitude. Another just sees a speck of light and has no such extra experience. The experience is subjective and endogenous, not a report about what's out there in reality beyond a pixel of light.
