Faith determined everything in the lives of medieval people. From the cradle to the grave. Christian festivals divided up the year, and people practised their faith in church, on pilgrimages, during processions. Every day they prayed to God, Jesus, Mary and the many saints every day. Also privately. Everything you did and thought was dominated by life after death, when you would be punished or rewarded for your life here on earth.
The luxury objects you can see here, bear witness to that faith among the elite. These citizens used objects to deepen their prayers at home. Thus, the cross is the symbol of Christianity: Jesus Christ died on the cross to save mankind.
Those who could afford it also bought a painting or statue of, for example, Mary with the Child Jesus, or of the suffering Christ. It was easier to empathise if you had a visual representation. People also used a so-called book of hours, an example of which you can see here: it is a manuscript with the texts of prayers to be read and recited at specific times of day.
You respectfully knelt on a prayer or kneeling bench. This Bruges example features the names Jesus and Mary at the top.