So if that is the case, how do you imagine that things work? Does God abandon me, and take complete offense, if I mistakenly entertain angels who are unaligned with Him and are really demons instead?
From experience I can testify that God puts up with a lot of mistakes from His followers.
He is the one who called me, He is the one who keeps me.
Personally I think the parable of the wheat and the tares is applicable. As God's servants, it is not our job to go around pulling out the tares, as much are we might be offended by their presence. Why? Because in doing so we damage the roots of the wheat growing up right beside them.
This is what I see happening when people attack individuals who are being used by God. Maybe all we can see is the sin in their lives, but for some reason God sees things differently and is using them for His purposes. And in what we might think is a holy crusade against the evils of sin, we turn ourselves into an enemy of God.
We cannot control who God chooses to use. I'm sure there was a list of several hundred thousand Israelis more qualified by our standards to be used instead of Samson. But it isn't our place to try to control God, or to pretend He isn't sovereign and doing things the way He sees fit. So we are left with only two choices. One is to get on board with what God is doing and contribute to the effort; the other is to take a stand against Him.