Religion in Public School

There is a 7th grade teacher who I don't get along with because he brings his religion to school with him (it's a public school and his religion isn't my kids' religion).  Anyway, my son has him this year and he hopefully learned to keep his mouth shut after my daughter's year with him because he didn't give his religious rules on the first day of school to the class like he did before.  Perhaps my whole "separate of church and state...you aren't a private school" spiel to the principal worked?  Here I thought I was going to make my own funny t shirts to wear to parent-teacher conferences this year and now I don't have to. As long as he behaves, I'll behave.  I can behave.  Really.