You are entitled to disagree, and I support that right, but I think we are on the same page.  I am saying that the protection offered by the "Freedom From Religion" interpretation means that you cannot legally be compelled to endorse or support a religion (or no religion) that conflicts with your own belief (or lack of belief).  You are correct to say it is not possible to avoid all exposure, but in those circumstances where a religious belief is being thrust at you in an inappropriate environment you are within your rights to oppose it and demand that it not be allowed to continue.

If, for example, you are a follower of religion A, you cannot be legally forced to endorse or support religion B.  Further, the government is not allowed to show favoritism toward any one religion over another.  Given the number of religions in the world, the only clear path to equal time for all religions is to allow no time for any of them, where the government is concerned. Personal piety is different.