When did organization turn out to be church?! Now, people may started worried about YMCA or YWCA. No one expect to send his/her kids to summer camp, and it turns out to be an assassin boot camp.
Actually, I just finished read a manga. That manga also depcits the church as a secret assassin organization.
The ending song is nice. I guess this anime is another anime with a lot of record companies' sponsorship. As long the music is good, I have no complain.