This is God's doing. This is the Lord's will. The eunuch is rescued in this story from his isolation, from his exclusion. But Philip and the church are rescued, too, from their narrowness, from their self-righteous judgements, from their misunderstanding of grace. This is how close the church came to being just a new version of the scribes and Pharisees' religion who appointed themselves the gatekeepers of grace deciding who's in and who's out.
Grace has no gatekeepers because grace has no gates.
We are the eunuch in this story because there is something about every one of us which would exclude us if it weren't for the radical, scandalous grace of God. If you doubt that, just ask me after worship and I will tell you why you don't really belong here. Don't let this word scare you. It is not the call to judge everyone and tell them they're going to hell unless they believe what you believe. It is not the call to be arrogant, intrusive, manipulative, or self-important or to target certain groups for religious extinction through spiritual imperialism.