Does the Bible command its reader to think and use reason? Yes, absolutely. Indeed, 1 Thessalonians 5:21 commands us to "Test everything; hold fast to the good." 1 Peter 3:15 says, "But in your hearts revere Christ as Lord. Always be prepared to give an answer to everyone who asks you to give the reason for the hope that you have. But do this with gentleness and respect." 2 Corinthians 10:3-5 says, "For though we live in the world, we do not wage war as the world does. The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds. We demolish arguments and every pretension that sets itself up against the knowledge of God, and we take captive every thought to make it obedient to Christ."
The book of Acts also gives us several examples of people who used reason and argumentation to persuade people of the truth of Christianity. For example, Acts 19:8 tells us that "Paul entered the synagogue and spoke boldly there for three months, arguing persuasively about the kingdom of God." Acts 18:27-28 tells us that "When Apollos wanted to go to Achaia, the brothers and sisters encouraged him and wrote to the disciples there to welcome him. When he arrived, he was a great help to those who by grace had believed. For he vigorously refuted his Jewish opponents in public debate, proving from the Scriptures that Jesus was the Messiah."