You make it sound as if the whole purpose of having a science class is to brainwash kids into believing that there is no reality outside of what can be tested through the “standard methods”.
IMO, the scientific method is very useful and has led to many advances that have made our lives more pleasant — that is its main purpose.
However, to teach kids about fundamental issues (origins of the universe, eternity, life, etc.) through the scientific method exclusively fundamentally distorts reality.
No, the whole purpose of having a science class is to teach kids the scientific method.
If we wanted to "brainwash kids" into believing there is no reality outside of the scientific method, then we would only have science class and not teach anything else. Obviously that's not the case. Teach history in history class, math in math class, religion in Sunday school and science in science class. What's so complicated about that?