You may see from where I'm coming. It's not just my actual practice - I know that I'll never worship an idol, or pray to ancestors, etc. I know that I will always be a Christian. But I am obliged to, and I want to, make sure that everyone who looks at me knows that I am living my life for the living God.
Was that too much? I hope not. Again, I just want to show you where I'm coming from.
Well, the bow to shomen is a gesture of respect (for the dojo and the art itself, as well as the founder(s) of that art). Its not
an act of worship, but if you still find it bothers you, talk to the sensei about it, most won't mind if you just skip that part.