This broader assessment of Finney's ST confirms my instincts: Folks who think Finney is a paragon of faithful evangelistic fervor 1) never read Finney; 2) didn't understand him (which is reasonable); or 3) are heretics themselves. Here's how the reviewer put it:
[I]f what we had just read could be called "Christian Theology," then the church had sinned grievously in its expulsion of Pelagius. There is nothing noteworthy to distinguish the one from the other. And if Finney believed what he wrote, then he was no Christian.