Your argument was, in essence, that if the commissioners saw that some weren't participating in the prayer, that they might hold that against those persons who weren't participating.  My reply was that ANY remark, religious or otherwise could spark a reaction that the commissioners would hold against an audience member.  In other words, you did not make an argument against religious remarks; you made an argument against remarks, period; which, of course, is a whole different issue.  But as an Establishment Clause issue goes, you have no argument.

The Establishment Clause issue is whether or not the remarks made could be considered Congress making a law respecting an establishment of religion (or, coercing one into a religion, if you like) or preventing someone's free expression of religion.  The issue is not whether the remarks could elicit a reaction that would be held against the audience.  But as you can see, this is far removed from the intent of the Constitutional Convention.