Balaam did a few things wrong:
One is God repeatedly sent a donkey to warn Balaam to stop, yet Balaam walked around it, then the donkey showed it was an angel, and then Balaam stopped (same happened to Paul, an Angel repeatedly told Paul to stop, yet Paul claims it was Satan trying to stop him??).
Mic 6:5-8 (5) O my people, remember now what Balak king of Moab consulted, and what Balaam the son of Beor answered him from Shittim unto Gilgal; that ye may know the righteousness of the LORD. (6) Wherewith shall I come before the LORD, and bow myself before the high God? shall I come before him with burnt offerings, with calves of a year old? (7) Will the LORD be pleased with thousands of rams, or with ten thousands of rivers of oil? shall I give my firstborn for my transgression, the fruit of my body for the sin of my soul? (8) He hath shewed thee, O man, what is good; and what doth the LORD require of thee, but to do justly, and to love mercy, and to walk humbly with thy God?
Now that is the most clear what Revelations speaks of, as the false Church!
God will not and does not need to sacrifice anything, so by telling the people this, is as Balaam did and quite clear in this, God would not Sacrifice his own Son; thus making all of Christianity Workers of Iniquity in Godís eyes.