Enlightenment is finding that there is nothing to find. Enlightenment is to come to know that there is nowhere to go. Enlightenment is the understanding that this is all, that this is perfect, that this is it. Enlightenment is not an achievement, it is an understanding that there is nothing to achieve, nowhere to go. You are already there - you have never been away. You cannot be away from there. God has never been missed. Maybe you have forgotten, that's all. Maybe you have fallen asleep, that's all.
I know of no religion or sect that has done or is doing without a house of God, variously described as a temple, a mosque, a church, a synagogue or agiary.
A man's ethical behaviour should be based effectually on sympathy, education, and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.
Whatever character our theology may ascribe to him, in reality God is the infinite ideal of Man, towards whom men move in their collective growth, with whom they seek their union of love as individuals, in whom they find their ideal of father, friend and beloved.