Making music at a pub is definitely much preferable to listening to a religious zealot selling his product to other religious zealots, so don't blame you one bit for not going! It can be interesting to ask questions at events like this, but more often than not the questions go unanswered and they instead opt to play for their intended audience.

Totally agree we should all be open to new ideas backed by evidence. Even just entertaining a new idea for the sake of challenging our own ideas can be good. Not being open to our own ideas being challenged creates dogmatic thinking, which only leads to a stagnant closed mind.