"For I can testify about them that they are zealous for God, but their zeal is not based on knowledge. For, being ignorant of the righteousness that comes from God, and seeking to establish their own, they have not submitted to God's righteousness." --Romans 10:2-3
Though Paul was referring to early Pharisaic opponents of Christianity in the above quote, the concept applies equally well to many modern groups who believe they are doing God's work through actions such as the following:
This is why it's important for every Christian, particularly pastors and church leaders such as the one at the church above to comprehend just how dangerous what they are doing really is...
"Not many of you should become teachers, my brothers and sisters, for you know that we who teach will be judged with greater strictness." --James 3:1