Today, I found this little passage from Chesterton highly relevant:
It is commonly the loose and latitudinarian Christians who pay quite indefensible compliments to Christianity. They talk as if there had never been any piety or pity until Christianity came, a point on which any mediaeval would have been eager to correct them. ... Christianity was the answer to a riddle, not the last truism uttered after a long talk. Only the other day I saw in an excellent weekly paper of Puritan tone this remark, that Christianity when stripped of its armour of dogma (as who should speak of a man stripped of his armour of bones), turned out to be nothing but the Quaker doctrine of the Inner Light. Now, if I were to say that Christianity came into the world specially to destroy the doctrine of the Inner Light, that would be an exaggeration. But it would be very much nearer to the truth.
... That Jones shall worship the god within him turns out ultimately to mean that Jones shall worship Jones. Let Jones worship the sun or moon, anything rather than the Inner Light; let Jones worship cats or crocodiles, if he can find any in his street, but not the god within. Christianity came into the world firstly in order to assert with violence that a man had not only to look inwards, but to look outwards, to behold with astonishment and enthusiasm a divine company and a divine captain. The only fun of being a Christian was that a man was not left alone with the Inner Light, but definitely recognized an outer light, fair as the sun, clear as the moon, terrible as an army with banners.
All the same, it will be as well if Jones does not worship the sun and moon. If he does, there is a tendency for him to imitate them; to say, that because the sun burns insects alive, he may burn insects alive. He thinks that because the sun gives people sun-stroke, he may give his neighbour measles. He thinks that because the moon is said to drive men mad, he may drive his wife mad. ... Nature worship is natural enough while the society is young, or, in other words, Pantheism is all right as long as it is the worship of Pan. But Nature has another side which experience and sin are not slow in finding out, and it is no flippancy to say of the god Pan that he soon showed the cloven hoof. The only objection to Natural Religionis that somehow it always becomes unnatural. A man loves Nature in the morning for her innocence and amiability, and at nightfall, if he is loving her still, it is for her darkness and her cruelty. He washes at dawn in clear water as did the Wise Man of the Stoics, yet, somehow at the dark end of the day, he is bathing in hot bull's blood, as did Julian the Apostate. The mere pursuit of health always leads to something unhealthy. Physical nature must not be made the direct object of obedience; it must be enjoyed, not worshipped. Stars and mountains must not be taken seriously. If they are, we end where the pagan nature worship ended. Because the earth is kind,we can imitate all her cruelties. Because sexuality is sane, we can all go mad about sexuality. Mere optimism had reached its insane and appropriate termination. The theory that everything was good had become an orgy of everything that was bad.
--G.K. Chesterton, Orthodoxy