If you want to keep things afloat, you need to keep your civilization striving for more - not to expand, or to get lazy, but to constantly attempt perfection in all that you do. Even when you know perfection is unattainable.
Science is a means to an end - to discover that which can be tested time and time again, to get the same result and predictably rely upon said discovery as solid information. Your society must ultimately strive for the truth of the world, one atomic step at a time. When you discover new truths, technology will follow suit - improving, in some form, one of the above listed needs for survival or society.
You don't need religion to have faith - you merely need something to have faith in. To believe in something you have no reason to believe. Either a god, or some kind of universal truth, etc - something you can't possibly comprehend the entirety of, but believe must in some form exist. This allows you to ward off incidental thoughts and diverting too far from a good mental state. You don't know that you won't be struck by lightning tomorrow, as you can't predict the future - but you can have faith that you won't.
You must always have that which you hate. Hate is motivation - hate is energy, power, and pride. Hate, however, must be controlled - you need to know what you hate, and you should want to hate it for good reason. Whether it be a group of people, or inherent flaws in your own being, or even elements of nature itself - you must have hate in order to overcome monumental adversity. No man fought for his nation without some kind of hate in his heart - either for the enemy, or for those that forced him to fight to begin with. Without hate, you cannot truly love.
To love is to find that which is worth struggling for - either your family, or your nation, or even an ideal. You have to be able to let yourself and others love. Otherwise, it all falls apart.
You need all of these. You can't just pick and choose, or go step by step - they're all simultaneously necessary. Much like the floors, walls, door, and roof are all necessary for a house. They all must form together.
You need social gestalt.
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