Culture and Anarchy: Ch 1, Sweetness and Light

In the "Sweetness and Light" section, Arnold takes aim at the Puritan element (of Dissenting, or Independent, Christians) in middle class English culture.
What does Arnold argue is wrong with the "Puritan" element in English society, and how does he argue this? How does he contrast this (consider here the way he SORT OF allows religion its positive value) with the "sweetness and light" which men of "culture and poetry" try to promote?

Here Arnold proposes that the Puritan's Independents organization holds their faith "The Dissidence of Dissent and the Protestantism of the Protestant religion" which Arnold relates to his concept of perfection, "sweetness and light". What Arnold says was being suggested is that one has no need for poetry or reading, but only of religion and the church, which is given to us in the language that "is in our mouths every day." He understands others respecting their religion, as it's something they believe in, that has done so much for them and started them down the road of "perfection" though it "wears such a brand of imperfection on its forehead as this." He feels the good of it, even just supposed good, can blind people to the imperfection. These people "can only be reached by the criticism which culture, like poetry, speaking of language not to be sophisticated, and resolutely testing these organizations by the ideal of a human perfection complete on all sides, applies to them." The only way people can see the downfalls of this religion is by knowledge brought to them via criticisms and poetry, which their religion puts down. It seems that Arnold is disgusted by the good things of the Puritans being so applauded, while the good side of regular educated men are not. Men who have many faults as well as many positive points are only seen for their faults, where as the Puritan church is seen only for it's positives and ideal of perfection. "And they have been punished for their failure, as the Puritan has been rewarded for his performance." But obviously these men still have Arnold's respect for their ideals, while the Puritans do not.
"They have been punished wherein they erred; but their ideal of beauty, of sweetness and light, and a human nature complete on all sides, remains the true ideal of perfection; just as the Puritann's ideal of perfection remains narrow and inadequate, although for what he did well he has been richly rewarded."