It's a waste to reply to UndecidedFrog and viole. You can say: this person has proven 'A' but they will say that another person has proven 'B'. They choose to believe the evidence of one set of people and you choose another. If you present anything from God, they will reject it because they have rejected God.
That is not a debate. Both sides have made a decision that ends all discussion. They are not interested in considering your perspective because they have already rejected the basis for it.
Perhaps it is a form of mental exercise - trying to refute any claim that a believer makes. The point is, they will refute it, regardless if it's based on personal experience, research, the Bible or a scientific study. They are not open to challenging their beliefs. Perhaps it is similar to Christians that claim to have all the answers and infuriate or hurt people who are honestly open and seeking.
They seem reasonable, intelligent people from the posts I read. Let them be and spend your energy on someone who wants to listen. Of course, it's another matter for topics which can be discussed... maybe who is going to win the next Melodi Grand Prix?