As you read through the poems in The Songs of Innocence and The Songs of Experience you can find lots of poems that deal with the topics in this post. "The Lamb" and "The Tyger" are about religious belief -- one on the goodness of Jesus and one about sin. These poems set up a kind of dicotomy between the two sets of poems.
If you look at both "Chimney Sweeper" poems, one attempts to make light of the job of chimney sweep for the young people who had the dangerous job, but the other is highly critical of the treatment of the chimney sweeps and the dangerous disregard socieity has for them.
Another "set" to consider are the two "Holy Thursday" poems. Here you can read for his attitude about both religion and society. The subject of both poems is the fate of orphans that cared for by the church. In one, the orphans are described as radiant and signing their joyful song. In the other they are described as miserable and their singing is actually a trembling cry, while they live in a place of "eternal winter."
You can find all kinds of poems that illustrate his attitudes, especially in the more critical Songs of Experience.