Rationally, He did, through the people I referenced above. He just didn't take away the hard hearts of the rest of us and we're only beginning to understand the we only experience 4 of many dimensions. God is outside the universe, so when men are given a glimpse of his reality, they tend to interpret it wrong. (I'm sure you've read this sort of reasoning, before.)
Smart people shouldn't exclude as real what they can't understand. Smart is as smart does. Don't take my word for it:
Blaise Pascal (1623-62): "There are two excesses: to exclude reason, to admit nothing but reason. The supreme achievement of reason is to realise that there is a limit to reason. Reason's last step is the recognition that there are an infinite number of things which are beyond it. It is merely feeble if it does not go as far as to realise that." Pascal B. Pensées (1657). London: Penguin Books, 1966. (Translated by A J Krailsheimer.)