There are an endless number of only religions and if we were to truly govern ourselves by any one of them, only one person, the one true believer, who would also be the most able to kill everybody else, would be left standing. By creating a constitutional government that permits both doubt and belief and separates the secular from the religious, a society has a better chance of surviving. Naturally all those folk who know the absolute truth, like killing the unborn is evil, will always try to upend the cart that makes it possible for the state to function. As one of our forefathers more or less said, we give you a democratic republic, it's up to you whether you can preserve it.
Humans are capable of two polar opposite evils, in my opinion. They can become fanatics, absolutely certain that what they have been inculcated to believe is the good actually is the good or they can believe that good is merely relative. Few seem to come to the realization that the good is only when the ego isn't.
The central realization of the enlightenment, in my opinion, is that the individual has an intrinsic value based on the fact that within us is a spark of the divine. The enlightenment happened because at a stage in Western development, numerous people because conscious of that spark within themselves.
Our culture is at a stage of regression because the number of people experiencing that realization, having that awakening experience, becoming enlightened themselves, is declining as a result of cultural drift. The fanatics and the relativist have filled the cultural stage. Darkness is attempting to settling back in.
The truth is within us , unseen as is the Kingdom of Heaven. There is nowhere to go, nothing to become, but to see, to experience this inner realization. To awaken is to experience self fulfillment. The Alpha and the Omega has no need of anything. To ride the river of time is to stop time and to be. To be is to love and to love is to be without fear. As one wise man said, "Relax and be happy!"
Imagine the violence and hatred of the fanatical mind that can tell a ten year old girl who was raped by her father she will burn in hell if she has an abortion. How disgusting the disgusted become.