There are several examples of having the facts without knowing the entire process that are accepted as true today. One example of not understanding the process but knowing the process is fact is photosynthesis, that is a plant’s ability to make sugar. We can see the carbon dioxide and the water go into the plant, we can trace those compounds to the chloroplasts and we can measure the sugar that comes out, but we have no idea of how it happened. Yet, photosynthesis is a fact. Another example is gravity. We know that gravity is the attraction of all matter. We do not know why. We have some theories about gravitational attraction, but none are proven. Yet the effects of gravity are measurable and predictable. Gravity is a fact of nature. We do not claim gravity is a theory just because we do not know how it works. There are several measurable natural phenomena that we can predict and use for human benefit, but the how and why may not clearly be known.
Evolution is one of those natural facts.
