I thought about putting this in the art or literature forums, but I think it really belongs here. Although we would, of course, be Superman mythicists that really doesn't prevent you from engaging in the religion (look at modern Gnostics and Satanists, for example). I really enjoy Superman comics as literature, of course, but I also think there is a deep and abiding significance to him which is not entirely intentional. He embodies so many symbols, he is the Logos of the sun. My favorite is Silver Age Superman with Curt Swan's art - Superman is God and Curt Swan is his prophet!
I have a serious interest in putting together literature on Superman as a religious figure - his Christ and Krishna character, his omnipotence and omniscience. The death of Superman mirrors not only the Christian resurrection stories but the more ancient story of the sun/sky god who destroys the chaos monster to save the world, dies in the process, and returns. I think it would be interesting to put together a Superman 'canon', a list of which comics are considered part of the official church literature.
This probably seems like a joke to many people, especially those who aren't in comic books, but I think it's accurate to say that comic books are modern mythology and no one embodies the Thunder Perfect Mind like the Man of Steel - who came from heaven, is superior in every way, and strives not only to live as humans but to do right by them. Worship, of course, is beside the point - rather, one wants to find oneself and understanding of the world to become like gods.
In Kingdom Come there is such a church, and of course many Superman comics have veiled or overt religious tones. An interesting point, Superman (at least in the Silver Age) worshipped the Kryptonian deity Rao, which is a name of Shiva - aka Galactus! Thanos is also an excellent personification of death, the will to death as a principle, the striving for vain power solely to annihilate the Universe which so offends us by alienating us. Jim Starlin's trippy work on this all-powerful anti-god bears a stark resemblance to early Zoroastrian dualism'sAhriman. Thanos means 'death', much like 'Mot', the death monster who fights the Sun God/son of God.
These are kind of disconnected ideas, but I think you might see what I mean: it is at least conceivable to put together a mythology and liturgical practice out of comic books. I just wish I knew someone else who was actually interested in it. Certainly finding icons wouldn't be a problem.