There was an opt-out clause, and Perry even mentioned it in his press release announcing the EO. Educate yourself and you won't look so ignorant the next time you post about this "mandate".
http://governor.state.tx.us/news/press-release/2292/
Parents may choose to opt out of mandatory vaccinations for reasons of conscience, including religious beliefs. The governors executive order directs DSHS to ease the opt out process by providing exemption request forms online.
http://www.freerepublic.com/focus/f-news/2777784/posts
There’s ur easy access opt out clause...now please stop using it as a defense.