When they can accurately relate things that they could not possibly have seen and heard, there's good reason to believe them. And I'm not saying you're being dishonest. I'm saying that you're giving an awful lot of weight to "maybe", "likely", "possibly".
I'm not up to speed on the OBE research, so I'll ask you. Have studies been done on people who were taken into the lab unable to see or hear their surroundings, given an OBE, then had their vision compared to the reality of the room? IOW, did anyone actually check to see if their brain is just making up the vision?
1. That's going to happen, but at that time it'll be too late to do you much good.
2. Should God do that today, within a few years we would see a groundswell of people claiming that it never happened. Within 50 years a significant percentage of the population would believe it wasn't for real. Witness the Holocaust during WWII. Immediately after we opened the camps and revealed to the world what was going on, most people accepted the truth for what it was. Within a short period of time, however, disbelief cropped up, and today we have a very active segment of the population trying to convince everyone else that it didn't happen. Should God do what you want Him to do, within a few generations He'd have to do it all over again because man will purposely deceive himself. I call that the "do a trick" theology, the idea that God has to continually prove His existence to a disbelieving people. Think about it, you're doing exactly what these people would do. Someone born after God revealed Himself would hear the stories of those who witnessed it, look around, and say, "I didn't see it, so I don't believe it, and if I see it for myself I won't believe it unless everyone else sees it too". And God would have to do it all over again, and again, and again.