Head over to Julie D.'s blog and join the conversation. Having just watched last night's episode (the timing is bad for catching it live) I have to say that I thought the Eko backstory combined with Eko and Charlie searching for the plane was the best episode so far. I don't think the writers of the show are religious, but they understand religious symbolism and definitely respect Catholicism. LOST is the best show on prime-time television, natch.
(Of course I don't catch any other shows on prime-time, but I'll stand up for LOST against anyone!)