Learn English – Word for “opening and closing the mouth?”

To be adventurous is to be willing to try new things (not necessarily action-packed).

Perhaps scientific

conforming with the principles or methods used in science: a scientific approach

The scientific method is defined as

principles and procedures for the systematic pursuit of knowledge involving the recognition and formulation of a problem, the collection of data through observation and experiment, and the formulation and testing of hypotheses

Scientists (and others practicing the scientific method, in work or their everyday lives) routinely have viewpoints, opinions and hypotheses about issues, but are ready to modify those positions based upon new evidence.

And, in anticipation of any objection that the initial example given was in the religious context, numerous scientists believe that their scientific approach is not incompatible with their religious beliefs, and many argue that their scientific approach demonstrates the validity of their religious positions.

Albert Einstein provides an example of the view that science and religion are compatible.