We see the things around us, study and discuss them. Then we accept only the things that appeal to our common sense. This is the rational way. Jainism teaches us to be rational. This is an important teaching of Jainism.
Some people believe in miracles.
They tend to believe in things written in religious books or taught by religious leaders. Sometimes people accept traditional things. Sometimes people copy others. Delusion is the root cause of many problems in life. A rational outlook, free from delusion, is the key to happiness and peace.