Witness of your Creator
Understanding what 'truth' is, and being aware of the standard of evidence, it follows that:
Given this evidence of your Creator, you are without excuse when you fail to recognize his existence.
(These things are confirmed in the King James bible, the book of Romans, chapters 1 and 2 (page 795)).
Is your worldview realistic?
You have the option to change the standard of evidence. If you want, you can raise the bar (Or lower it) to suit your desired views. This will define your worldview: the things you hold to be true. But why raise the bar? And by what criteria?
More information on worldview is available here.
From Webster's 1828 dictionary:
PRO'BATIVE, adjective Serving for trial or proof.
WITNESS, noun Testimony; attestation of a fact or event. That which furnishes evidence or proof.