And just to clarify, my blog piece is not about whether theism is dead in the world. It obviously isn't for many. My blog is in large part about whether and how a philosophical agnostic can find meaning in Christian mythology. So the question I address is whether for the individual moving beyond theism, can there still be meaning in Christianity. And I've personally decided the answer is "yes." You may decide differently.
As far as the rituals, they are for me really about community and the personal meaning of the symbols anyway. So I can change my personal meanings I associate without being too bothered by the rituals. Except, I don't care for the Creed.
Baptism is a symbol of cleansing or death and rebirth. If someone thinks they now have a new perspective on themselves and reality, baptism is a fine ritual to publicly affirm that new perspective.
Confirmation is not something I'd participate in because it concerns having "right belief" to a large extent, and I consider that to anti-Christian.
The Eucharist represents our sharing in the unity of community in love. So I have no problem participating in the Eucharist.
The Bible is full of great art (and some other stuff). It's not the only human art that carries divine wisdom in my view, nor is there anything "authoritative" about the Bible except to the extent that I find personal meaning in a particular passage, idea or book.
Jesus is an archetypal symbol representing the sacrifice of egoism and self in non-violence and love, giving up certainty, guilt and fear to reclaim one's power over their perspective and attain personal responsibility for how I see the world and others in it. To me, it doesn't matter whether there even was a Jesus in history, or what he said or did, though I understand it means a great deal to some. I didn't find much personal meaning in Christianity until I set aside the idea of an actual, historical Jesus, which allowed me to use Christian mythology as mythology. That made it far more valuable and useful to me.