Reason

The way a person sees life and the world guides their decisions, choices, and behavior. Though people’s perceptions and beliefs often tend to be underdeveloped and poorly articulated, virtually everyone has a worldview. Because worldviews come to fundamentally different conclusions about the big questions of life; logic, reason, testing, and evaluation are employed.

For example, Naturalism claims nature is the sole reality but Pantheism asserts that all is God and God is all while Theism insists that the world is the product of an infinite, personal, Creator God. Logically, they cannot all be true.

It is unfortunate that the postmodern pluralistic relativism currently dominant in secular comparitive religious studies recklessly asserts syncretization and argues that all truth-claims are equal to each other with any differences merely linguistic. This logic and argumentation is deeply flawed and has led to all sorts of error in the handling of truth-claims misrepresenting both the worldviews themselves and their representation of reality. 

By applying logic, reason, testing, and evaluation methods of critical thinking correctly to the various aspects of each particular worldview and the evidences in the aggregate, the accuracy of worldviews can be analyzed to determine how well they fit reality.