mom4 - You can file an exemption and if it is a public school they HAVE TO take your child if you have the proper paperwork. Google texas vaccine exemption or something like that. DH & I did this to avoid having DS vaxed at birth (and since then). He is not in school yet, but, if you have legal documentation they cannot turn your child away unless it is a private school.
Do not worry! This can be done! The school may even have some type of vaccine form and you can just check "no vaccinations for philosophical or religious reasons" or whatever it says.
I would still have a legal, notorized document though for your personal file in case it ever comes into question.