You say “I’m quite mystified by the connection between Blake's tyger and the Christ”. But to use Amalian pun, mystic poetry is always mystifying. Here the connection is straightforward. Amal himself has summarized in the paragraph I’ve reproduced. The theme is Biblical which occupies greatly Milton’s Paradise Lost. Some angels have revolted against the Almighty and turned themselves into his enemies, the Satanic horde. To quell the rebellion comes forth a power of the divine Godhead, that is Christ, ferocious in nature, with immortal dreadfulness in action, his wrath unstoppable. It is in that poise Blake visualizes him as the Tyger burning bright in the forests of the night. The enemy is defeated, and the job is done. The stars represent these fallen angels who had revolted, and now they throw the weapons of rebel and revolt, and water heaven with their tears. The rest in the poem is stupefied elaboration as how this Tyger was fashioned by the almighty Godhead, one who also created a meek and mild Lamb. If Christ here is the Tyger in his wrathful aspect, elsewhere, in fact everywhere else, he is God’s sweet and innocent Lamb. The poet wonders if the same Godhead could create two creatures with such opposing qualities. Could it be the same Mahashakti from whom come forth Mahalakshmi and Mahakali? ~ RYD