In UK atheists considred more moral than theists.

[I_am_not_mafia]

Use a device, such as a camera that can also measure red. Same as with any other colour.

This is reproducible and the steps can be unambiguously described in detail.

There is no such device that can detect a god, or a soul, or a spirit or any type of supernatural force.

How would YOU determine it's the color red without having the ability to see it for your self?

You were creating a hypothetical example where no one could see the colour red, so it's whatever people collectively decide to call that band of frequencies.

In the same way that no one can see infra-red or ultra-violate can still measure that these radio waves exist using equipment.

How can you tell that radio waves and infrared light exist if you cannot see them?

For example, Ultra-violet burns our skin.

I can buy a camera filter for example that blocks out all frequencies except for infra-red and take pictures on a very bright day for example.

You end up with pictures like this (not mine but I have done some which are similar in the past)

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There are plenty of ways of measuring and more importantly reliably using these frequencies without being able to personally experience them.