Why do Catholics, and mainline protestants more open to new ideas than the fundamentalists

Some denominations encourage people to "study and show thyself approved" while others discourage any investigation. To take everything "literally" means you are still taking someone's interpretation of what is literally means. Of course, it isn't a positive thing to be accepting of any idea unless it lines up with the teachings of God. Some things should be investigated and then rejected. I would never take a position on a topic that I had not investigated. <*)))><