Rationalism, like many cults, is just a formalizing of what is already a natural human weakness. It’s part of the human weakness to fill in the blanks and make assumptions.  It’s part of human weakness to be bound up by our own presuppositions, and to think that we are right in doing so.  You will find rationalism in every organization, secular and religious.  Christians need to turn from rationalism and turn to Christ.

It is perfectly natural to fill in the blanks.  The human mind does this automatically.