"What would it take to convince you of God's existence?"

I suspect that one of two things was going on. They may have not really cared to talk about the supernatural but were intending to use that extreme case as a springboard to talk about evidence and belief in general. Alternatively, if they thought the topic as phrased was apt, likely they were not sufficiently deft at dealing with and unpacking unhelpful terms like "God".

no one else at the meetup seemed interested in an evidential approach

You should have abandoned sharing your list (hard to do after putting effort into it) and discussed why an evidential approach was better than their approaches at a philosophical level. If you don't have a separate long mental list of why it is, then even if it is the right approach, you shouldn't feel too superior over people using the wrong approach who can't justify their philosophical approach because you can't justify yours either, you just know how to use it.