Blake is considered a visionary because he incorporates art into his poetry to add a second layer of meaning. His style of art and engraving in his poems paved the way for lots of new literary art types. This is the most important point which shows that Blake is a visionary. I assume that the church was just as important as it typically was in older times, so his questioning of the church is revolutionary and quite rebellious. As a Romantic it makes sense that he would, and as a poet it is quite fitting that asks questions of the deepest soul in a lyrical and hidden form.
their environment contributed to their actions because they lived on an island and they had to do certain things in order to survive and yes there is an animal.
It would be considered a fragment
I can't see the examples. But assonance means a resemblance in the sounds of words or syllables either between their vowels (e.g., meat, bean) or between their consonants (e.g., keep, cape).