Dover Beach: Personal Reflection

I found this poem to be one of the most difficult to understand from this section. The speaker is standing, I think literally, on the beaches of Dover in England. He is comparing the sea in front of him to the Sea of Faith. The speaker states that faith has been receding and less people are believing in God. My confusion stems from this knowledge. I'm not sure whether he himself believes in God or if he is even troubled by the lack of faith. However, the last line "where ignorant armies clash by night" leads me to believe that the speaker is angry with the injustices in the world. Whether it is in war or faith, the speaker seems to be condemning the world around him for their behavior.