I’ve got to treat him as though he were a god
Arabella Trefoil is speaking of the deference she must show to Lord Rufford during her attempted courtship with him. His title and land afford him great respect, and Arabella feels she must honor him accordingly, much like a human must honor a god. Specifically, Trollope may be referring to Greek and Roman reverence of the gods, shown through humility and offerings. [CD 2012]