Dan you should know being a christian we cannot judge another persons experience in God. The number here is not relevant only the point is to the collective witness of all those who believe they have had an experience with God. There is a 2015 version that says 2.4 billion - 1/3 of the worlds population. This however is not the real point of what was posted earlier.
But you can't then deny the God experiences of Muslims. Or those of Buddhists (such as they are). Or of any of the many other religions. And, among those 2.4 billion that you *claim* have had an experience (a claim with no evidence to back it up), how many of those experiences were NOT valid experiences (ones that agree with your interpretation of your scriptures).
Your problem is that you are either inflating the numbers here (by counting Christians you don't agree with and are not 'true' Christians) or you are underestimating the numbers by not counting all the other religious experiences of the world.
The first undermines your claim that it is common enough to be the default position and needs to be taken seriously as such. The second undermines your claim of consistency.
In fact, of course, people across the world and from all major religions experience what are known as religious experiences. Those who adopt a theistic system attribute these experiences to contact with a God. Others interpret them differently.
My view is that these are *all* how the brain produces illusions when under certain types of stress or when trained in certain ways. This view can be backed up by evidence from several different directions, including brain scans, testimony of those who train themselves to hear voices (in a non-religious context), the experiences induced by some drugs, etc.
These collectively show that the experiences are NOT experiences of some other reality, but are, instead, illusions produced by a stressed brain. And that explains both the commonalities and the differences in such experiences.
Now, given these *known* capabilities of the brain, why would we expect *any* of these experiences to be valid and real?