Is it immoral to believe in anecdotal "answered prayer?"

[Subfallen]

I know a late-twenties missionary who is working in Turkey. While he was swimming at the beach, he lost his wedding ring. Later, after praying over Psalms 33:7 ("He gathereth the waters of the sea together as a heap: he layeth up the depth in storehouses."), this spiritually minded young man recovered his symbolic jewelry from a tidal pool.

He believes this was a Divine miracle of direct answered prayer.

At first blush you probably dismiss my friend as a clinical egomaniac who should not be held morally accountable for his beliefs. But say we ignore this contention. Is he is immoral to believe in a God that intervenes for the recovery of lost trinkets while innocent children are starving to death?