Ian McCormack was swimming when he was stung by 5 lethal boxer jellyfish, 1 will kill a man... He died and went to Heaven. He came back a different man... He probably did not fake any of it.
He talks about what Heaven was like. I link two videos from him on YT, the first is 15 minutes long; the second about 1 hour 26 minutes. He tells of his experience of Heaven and Hell, he speaks with God.
Here is Dr Eben Alexander III, M.D., an eminent neurosurgeon who at the height of his brilliant career, was struck with a brain infection that inexplicably did not kill him, nor leave him a quadriplegic, nor a vegetable. After over a week in coma, he inexplicably came out of coma with a perfect memory of his experience on the other side. Before the coma he had been an agnostic, practical atheist. After he came back, you will not be able to convince him that Heaven and Hell and God do not exist.
I read his book, it's the best access to his full testimony in my opinion:
One of his video interviews (1 hour 40 minutes).
Neither MacCormack nor Alexander are atheists or materialists anymore. They are not what they were before there "encounter with God".