can you see Allah?

Teacher NON-MUSLIM asked the MUSLIM students.

Teacher : Can you see ALLAH?
Class : No.
Teacher : Can you touch ALLAH?
... Class : No.
Teacher : Then, there isn't ALLAH!!

*Student raise their hand and says*

Student : Sir, can you see your brain?
Teacher : No.
Student : Can you touch your brain?
Teacher : No.
Student : Oh okay, so you don't have a brain?