Before my becoming a Christian, I would handle such by just letting such things go right over my head. As for the Lord's prayer... just as a sign of being polite to others, I would bow my head in silence and not say a word. Those who wanted would say it along with the others.
Back when I considered myself an atheist, such things never bothered me.
When I started to question what I truly do believe...is there really a God like others say? Well my own inner struggle did have things start to bother me.
So two things you can do... Look into if there is a God or just let it go right over your head.
Your at meetings to gather support and info to help you stay sober. Make that your focus for now.
and congratulations on making a meeting.
How was it other then that?