Answer:

Introduction:

The assertion made by Ernest Hemingway, a celebrated American novelist and journalist, seems to encapsulate a deep philosophical standpoint. This statement, at first glance, appears to draw a definitive line between intellectualism and religious belief. However, it also raises profound questions about the nature of belief, rationality, and the human experience.

Body:

Rationality and Belief:

• Hemingway’s statement could be interpreted as a commentary on the perceived conflict between rationality and religious faith. 
• The assumption here is that rational, critical thinking leads inevitably to atheism. 
• However, this overlooks the fact that many intellectuals and scientists have held deep religious beliefs. 
• For example, Isaac Newton, often hailed as one of the greatest scientists, was deeply religious. His work in physics was, in his view, part of understanding God’s creation.

The Diversity of Intellectual Thought:

• Asserting that all thinking individuals are atheists negates the rich diversity of intellectual thought across cultures and times. 
• Philosophers like Socrates, who questioned the nature of gods, coexisted with others like St. Thomas Aquinas, who sought to intellectually defend the existence of God.

Atheism and Agnosticism:

• The statement seems to conflate atheism with intellectualism, but atheism and agnosticism are themselves diverse in thought. 
• Atheism is the lack of belief in deities, whereas agnosticism deals with the belief that the existence or non-existence of deities is unknown or unknowable.
• Intellectual inquiry can lead to either position, or even to a reaffirmation of faith.

Subjectivity in Belief and Reasoning:

• Human belief systems are often influenced by a myriad of factors including culture, upbringing, personal experiences, and emotional predispositions. 
• The journey towards atheism or faith is a deeply personal one and is not solely governed by intellectual reasoning.

Conclusion:

While Ernest Hemingway’s statement makes a bold claim about the relationship between intelligence and belief, it oversimplifies a complex and multifaceted issue. Intellectualism manifests in myriad forms and is not limited to the acceptance or rejection of religious beliefs. The essence of intellectual thought lies in the continuous pursuit of understanding, questioning, and exploring diverse perspectives, whether they lead one towards atheism, agnosticism, or a deepened religious faith. Recognizing this diversity is crucial in appreciating the broad spectrum of human thought and experience.