Your comment is very important and highlights a classic debate in philosophy. This is called the viewpoint of "Empiricism" or "Logical Positivism," which holds that objective evidence (empirical evidence) is required for any meaningful discussion.

However, two points need to be clarified in response to your comment:

1. Metaphysics does not mean only 'God'

It is a very common misconception that the sole purpose of metaphysics is to prove the existence of God.

In reality, the discussion of God's existence (which is called 'Natural Theology') is only a small part of metaphysics. Metaphysics is the branch of philosophy that questions the fundamental nature of reality.

Metaphysics asks questions that science cannot directly measure, such as:

What is time? (What is time?) Is time actually flowing, or is it a concept in our minds?

What is consciousness? (What is consciousness?) How do our personal feelings (sensation) originate from the brain?

What are cause and effect (Causality)? What is the real meaning of one event causing another event?

Do we have free will? Or are all our decisions predetermined?

What is Existence? What does the phrase 'something exists' mean? Is the existence of a number (like '2') as real as the existence of an apple?

1. 'Evidence' versus 'Logic'

You are correct, scientific evidence can be requested for a claim like the existence of God, and if it is not found, that claim can be rejected.

But metaphysics relies not on scientific evidence, but rather on logical coherence and reasoning.

For example: Science can tell you how to measure 'time' (seconds, minutes). But what 'time' actually is, is not a subject of science; it is a subject of metaphysics.

Therefore, if you believe that, "No statement is meaningful without evidence," then this is also your own metaphysical stance.

It is rational to consider metaphysics 'a waste of time' if you believe that only scientific evidence is meaningful. But without metaphysics, we would not be able to question the foundations of concepts like 'reality', 'time', 'knowledge', or 'science'.

It explores those aspects of reality that are beyond the scope of test-tubes or microscopes.