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Just like religion. Except there is no evidence for anything said in religion.

Problem is that there is evidence that this happened. Being presented as fact is a slap in the face to scientifuc theory because it is presented as fact.

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The computer and many other modern marvels like bio tech depend upon quantum theory which is highly theoretical and not a product of direct observation but mathematical models and behavior prediction. Nevertheless, its uses, values, and products are quite tangible.

Much of our knowledge of the universe is a combination of theory and observation. For example, if you bounce light off a piece of copper, you will get an exact frequency of light that is one of the properties of this element. By breaking down the light we get from distant objects, we can detect, at least partially, what their composition is when we see these refractory signatures. We also know the values and characteristics of gravity and these can be tested locally and by their consistency with observation of the planets and their orbits.

We use these values to determine the mass of the universe and measure this against its momentum and if there is a significant discrepancy between the projected result and the observation, we need to account for this. Either the theory of gravity only works in our neighborhood or some other force is at work that accounts for the difference. That is how the theory of dark matter arose. There is simply not enough observed matter in our galaxies to keep them from flying apart. So to characterize these theories as pure guesswork is misleading. These are educated guess based upon a combination of experiment, theory, observation, and calculation.

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