Here’s the problem. Secularism is based on made-up stuff (assumptions). Evolutionism is a series of stories based on made-up stuff. Everyone who follows Christ is led and taught by the Holy Spirit on a moment-by-moment basis. We know Him. He reveals things to us. He reveals that the Bible is His Word without error. Anyone can test this.
If you are an open-minded Secularist, and you want to test this, you just need to ask God to pardon your sins and your bad attitude toward Him. Ask Him to forgive all the times that you refused to acknowledge Him when He revealed Himself to you through His Creation. Do this with sincerity. Then, ask Christ to be your Lord and Savior, to rule over you, leading you and teaching you moment by moment. Submit to Him. He will reveal Himself to you if you do this with sincerity, respect, and persistence. He will then begin to reveal to you such things as the reliability of the Bible. In fact, He’ll begin to speak to you through the Bible. You’ll begin to desire to be with other Christians and you’ll find that God speaks to you through them by the Holy Spirit. Then, you’ll know. There is no way that you can verify your made-up stuff to yourself.