Dear Rabbi Simon
How do you answer a child of 3 when he tells you that “I speak to Hashem but He does not answer me”?
Thank you for practical question, at the crossroads of philosophy and חינוך.
Based on the limited information you provide, I suggest you encourage him to continue to speak to Hashem. Tell him that as he gets older he will be able to study Torah and learn more and more about what Hashem says to us.
Rabbi Rashi Simon