I'm sorry, but you will need to provide support for your claims and conclusions. Otherwise, they have to be considered unreliable. Your rules, not mine.
The problem here is that at some point you have to consider some things you consider true to be foundational, and therefore usable for support for other things within your own personal paradigm. In order for these things to be considered to be true would dictate where that person has placed their own faith. That's one of the great ironies of atheism, within its ranks reside some of the most blindly religious people I've ever seen. They just bow to the god of illogical reasoning instead of another, and their scriptures state, 'and science said' rather than 'and God said'.