A little clarification is appropriate here.
The topic was ID. The OP already raised the question of whether ID is an attempt to get around restrictions due church/state separation issues. Discussion of that is on topic.
The thread started to go astray in the second half of
Message 3, when that message argued that the constitution was being wrongly applied.
In my opinion, ordinary discussion needs to be tolerant of a little digression here and there. Thus
Message 3 was not necessarily a problem. Likewise, I did not see a serious problem in
Message 6, since that was a rebuttal of the second half of
Message 3.
Shortly after that, it became clear that the thread was being dominated by discussions on constitutional interpretation. It was clear by then that it had gone beyond an allowable digression into being seriously off-topic.
In summary, my view is that minor digressions can be tolerated. Major digressions (those that come to dominate the discussion) are a problem and should be avoided. Those who feel a strong need to continue with a digression should open a separate thread.