Lutheran Earth-Day Message

It's pointed out as being an interfaith message. Does the fact that it "had to" be an interfaith message enhance or detract from its credibility? If it's purely an interfaith message, I'd prefer he take his collar off while saying it. I wouldn't go to a Lutheran pastor to find a message if I wanted an interfaith one. If the message only finds credibility when condensed or excised to an interfaith content, I guess I"m not as interested in it.