To begin, anthropomorphic needs to be defined. This term is also known as personification. Both terms refer to times where non-human and non-living things are given human characteristics. This include the giving of human characteristics to god/Gods (since they are considered supernatural).
In the case of Jonathon Edwards' "Sinners in the Hands of an Angry God," three anthropomorphic examples are as follows.
1) "Threatened the Vengeance of God on the wicked." Here, God is illustrated as enacting his vengeance (punishment for a wrong) upon mankind. Since not human, God cannot enact revenge upon anything.
2) "He can most easily do it" (cast men into Hell). Here, God is able to hurl men (mankind) into Hell. Since God does not exist on earth, and is not (again) human, He cannot throw men into anything.
3) "God’s [sic] using his Power at any Moment to destroy them." Again, God is not human and, therefore, cannot destroy anything, let alone mankind.