For a person to claim this is a government establishment of religion belittles the very premise of the 1st Amendment. Erecting a piece of rubble in a memorial that is shaped like a cross in now way forces anyone to worship Jesus or any other god.
In fact the atheists who continually press the issue of secular humanism and complete godlessness are attempting to do the very thing they hate. They themselves are forcing a religious system of godlessness upon American citizens who for the most part at least believe in God, and of whom most are Christians.
To say this or placing the Ten Commandments in public view on public grounds is an establishment of religion by a government is preposterous. Freedom of worship and Freedom to worship any god is one of the things that makes America great, and the freedom to worship man and self (for the atheist) is also not prevented nor endorsed.
If it makes you sick, perhaps you should question why? If there is no God then why are you so worried? If there is, then what does that mean for you?