I can imagine that the oceanic feeling could become connected with religion later on. That feeling of oneness with the universe which is its ideational content sounds very like a first attempt at the consolations of religion, like another way taken by the ego of denying the dangers it sees threatening it in the external world.

Observe the difference between your attitude to illusions and mine. You have to defend the religious illusion with all your might. If it becomes discredited - and indeed the threat to it is great enough - then your world collapses. There is nothing left for you but to despair of everything, of civilization and the future of mankind. From that bondage I am, we are, free. Since we are prepared to renounce a good part of our infantile wishes, we can bear it if a few of our expectations turn out to be illusions.

Time spent with cats is never wasted.