Yes, I have a problem with people pushing their religious beliefs on schoolchildren, outside of a comparative religion type of class. Let's not pretend that you weren't doing that.
When I was a child in elementary school, we used to have someone come in once a week to sing Christian songs (i.e. Songs praising Jesus) with our class. Of course, being a child and a Christian, I didn't think much of it, except for that fact that we had a Jewish child in our classroom that had to leave every time this guy came into our classroom. I still didn't think much of it, being ignorant of what a Jewish person was at the time. But when I think about it now, I wonder why that was forced upon us in such a way that some of the students had to actually leave the classroom and go waste time doing I'm not even sure what, while the rest of us wasted our time singing about Jesus instead of working on math or social studies or something. And I wonder how that Jewish student felt when they had to stand up in front of everyone and leave the room. I don't see how that is fair and I don't see why anyone felt the need to have us praise Jesus once a week in a public school. That's what church is for. Or your home. Or the street corner. Or basically anywhere else.
I will not stop it until you stop pushing your religion in the wrong venues, on impressionable minds who don't have a say in the matter.