I wanted to hijack and clarify what I said before the flood comes. Admittedly it is a whole lot of speculation, but my point wasn't about Reimu or rather the Hakurei's personal position and relation with the Dragon. Yes, Iku is technically closer, working for the Palace and all, but it's rather about who embodies what. It's who is ultimately best suited to represent Dragon and Gensokyo, if not in official stance, then in spirit.
Gensokyo needs Dragon and the Hakurei Barrier, which likely couldn't have been formed without Dragon. Gensokyo needs the Barrier which needed Dragon, to last. Gensokyo and the Barrier are essentially the Dragon's whim, its existence, with a few others, and its lasting legacy, Gensokyo, the Barrier, the Dragon, it's essentially all as one. And whatever the Hakurei does and their duties entail, they're dedicated to the lasting of the Barrier, and so come to embody Gensokyo and the Dragon's legacy itself.
Also, yeah, I doubt the Dragon cares about faith, because like I said, there's no faith to be gained or lost, necessarily. As far as anyone is concerned, it's fact. Is there any doubt the Founding Fathers formed the USA? Unless you're a conspiracy nut, no, not really. The belief, faith, or rather the truth that Dragon had some huge hand in forming Gensokyo and owes its existence to him wouldn't be altered by someone also choosing to follow Reimu or Byakuren or whoever. As I said, it just "is", no matter what.
Now back to the demo release. Ichirin's new costume is pretty damn cool. She was on my wantlist, so I'm looking forward to playing as her. Too bad I likely won't be able to run the thing until an upgrade of some kind.