AGREED:
(Below, your thoughts paraphrased)

MEN question challenge universal beliefs.

Physical truths, gravity, magnetism, DO NOT require belief.

Gravity and electricity cannot be seen; evidence of their works prove their reality.

By works of unseen things an observer becomes convinced of their existence.

Ones mind is stimulated...asks... Why is / must this, be so?

Unseen, or 'spiritual things' are made evident by their works.

mistake of combining Christianity and religion in one kettle.
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(Nem: DEFINITIONS DO HELP CREATE CONFUSION: EXAMPLE:

CHRISTIANITY: the (Christian) (Religion) RELIGION: a set of beliefs; a specific fundamental set of beliefs; the body of persons adhering to a particular set of beliefs).
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YOUR SUMMATION (paraphrased):

Christianity - spiritual,
Religion - physical,
mutually incompatible because of works exhibited by each.
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Nem:

There is no question that ENERGIES mostly unseen (which some folks call spiritual) PERFORM WORKS that are seen (physical).

THE CHALLENGES that arises by DEIFYING them and or MYSTIFYING them (Christianity-spiritual) (Religion-physical) are many, and difficult to overcome, which is why most folks never pursue the task. It is much easier–due to indoctrination–to just accept “the mystery of god” rather than do the research to find out the truth.

P.S. Sorry about the paraphrasing, Brother Watchman....if I missed your point in doing so, that wouldn’t surprise me. I’m easily confused.