Questions about the exegesis of a particular passage, especially Old Testament questions that don't have any particular Christian content, ought to be moved to Biblical Hermeneutics.
Both sites are doing well!
Christianity.SE hit a seminal moment yesterday: homework questions! Ok, they are a pain to deal with and I feel like I wasted time on someone who just wanted to pass a class without learning anything, but it means that someone out there thinks we provide good answers. Most likely, they found us through Google. I don't see any reason not to expect more people being attracted by (what I've come to appreciate as) our high level content. The other signs I can see look really good as well.
Hermeneutics.SE is also doing well, though we are a few months behind. This morning, I was encouraged by an answer (soon to be a comment) thanking us for the great answers on a question about Job. (I should note that I was the only person to participate in the question who has any meaningful participation in both sites.) Google seems to be picking up our content as well. Our "vital signs" are slowly improving and I'm confident that we will have steady (albeit slow) growth and excellent content for a long time. We could certainly use more questions and more expert participants, but we are going to be ok without any help.
While there is some overlap in subject (the questions listed above are, no doubt on topic), there are people who will never visit Christianity.SE because of theological and cultural reasons and vice versa. Our best exegetes on the Tanakh (Old Testament) are Jewish and have no reason to visit a Christian site. Others, such as myself, have been suspicious of the usefulness of this site. I have come around, but mostly because of experts who, in turn, are not likely to participate in the Hermeneutics site! If I want to read Peter Turner's answers on Christianity, I better come here.
Expecting people to come to Christianity.SE to answer Biblical Hermeneutics questions seems, um, selfish to me at this point. There are two sites where exegesis of the Bible (three if limited to the Hebrew Bible) are on-topic and unless one of them fails, there's nothing to be done about it. It's water under the bridge.
Moderation will get harder in the future
I'm on record saying that Christianity will be difficult to moderate. One of the reasons is that there are too many viewpoints on any particular question that claim to be "Christian". The more people who participate on the site, the more Christian perspectives there will be to mediate between. Now moving questions is no silver bullet to the problem, but I think it's a useful moderation tool. If you have a question that isn't asking for a Christian perspective, but just wants to know that the Bible means, it makes sense to move the question where it fits best. Of the questions listed above, only one even hints at Christian content. One of them makes clear that they don't want a doctrinal answer, but just to know what the passage means! If we don't move questions that have little-to-no Christian content, how can we expect people to not post off-topic questions in the future?
Don't tell me that any question about the Bible is on-topic here. Even Jesus is sometimes off topic. Of course, if a question asks for a Christian interpretation, then it is better to ask it here. But if the question is of the "What the heck does this mean?" variety, we are doing the asker a disservice by not pointing them to the best place to get an answer. This is doubly true if the question is about the Old Testament, since a Jewish answer will not thrive here any more than a Christian answer will thrive on the Jewish Life & Learning site.
Bottom line: if a question isn't about Christianity, it doesn't belong even if it included several "Christian" keywords.