The whole point of building theoretical systems is to explain what humans know by pre-theoretical experience. That is the starting point for any philosophy. That is the data it seeks to explain. If it fails to explain the data of experience, then it has failed the test. It has been falsified.

Finding Truth: 5 Principles for Unmasking Atheism, Secularism, and Other God Substitutes (ed. David C Cook, 2015) - ISBN: 9780781413282