“I don’t care what their message is, you don’t engage children in anything without the parent’s permission. Or at least knowledge.”
If their parents won’t and the Child Evangelism Fellowship’s Good News Club can’t, who will lead these children to Christ?
What if was the Greater Portland Muslim Outreach Project that was messing with the kids. Would you be OK with that?
Jesus never forced himself on people. You could merely pray for these children and mountains would be moved. (merely! ha)
However, if you want to save these children, then approach the family unit, the mother and/or father.
You don’t have to get the parents to come, but you must go through them. They are the God given authority over these children.