Answered by Ustadh Salman Younas
Question: If an atheist asks me who created God, how should I answer?
Answer: assalamu alaykum
The question is deemed to be rationally absurd, This is because God is a rationally necessary being, meaning His being is pre-eternal, not consigned to time and space, and unchanging. Consequently, the question, “who created God” is considered irrational and absurd as it is inapplicable to God.
Rather, such a question applies only to existent entities that are contingent and possible, such as the universe. The universe could have been or could not have been and had a beginning. Therefore, the question of how it came to be is applicable i.e. “what/who created the universe?”. God, however, always was without beginning and so the question of how He came to be makes no sense as it contradicts the concept of beginninglessness.
For more details on this, please see: The Necessary Attributes of God and the Logical Absurdity of Infinite Regression
Checked & Approved by Shaykh Faraz Rabbani