The argument from ignorance is a logical fallacy, also known as the God-of-the-gaps argument, whereby someone says, "I am unaware of a natural explanation for [some phenomenon]; therefore we have evidence for the supernatural."
Secular prophecies to the contrary, religion is not going away. And despite the hopes of certain nostalgic believers, religion will not regain, at least in the West, the social ascendancy it once enjoyed.
Sometimes you experience a desire for God in very common situations: for example, standing silently in the snowy woods on a winter's day, finding yourself moved to tears during a movie, recognizing a strange sense of connection during a church service...
The spiritual experience usually comes about in altered states, but what does the recurring substance of the experience signify? What is that "something deeper and larger than ourselves" to which the experience seems to connect us?