I didn't know you had a background in science. The main reason I believe in evolution is because we have similarities, both anatomical and genetic, with animals. Why would God make us so similar if we were not related?
Well ... how similar is similar?
I often hear it suggested that God used the same "building blocks" and the same "plans" for various animals. And that's true in a sense.
How different would have us be? Having a different number of eyes or limbs? Requiring a different source of energy for metabolism? Requiring a different gas or concentration of gas to breathe? To not be carbon-based at all?
Think about this ... if humans and monkeys and birds were completely dissimilar from one another, down to a metabolic level, such that they could not all eat fruit (among other things), then a different ecosystem would be required to support each one. If oxygen needs were different, we couldn't even survive on the same planet.
The created world was made to be in incredible harmony with itself. The delicate balance of many systems of animals, plants, and the natural world support each other in many intricate ways. And we and the animals all need to survive in the same system, eating the same foods (broadly), breathing the same air (even fishes etc. who are specialized to draw oxygen from water), and drinking the same water. So on a very basic level we NEED to be the same in order to exist together.
Beyond that there ARE differences, if you examine all creatures. Two limbs, four, six, eight, many, or none. Two eyes, many, none, or one "kind of" eye. Crawling, swimming, flying, walking (on two legs or four or more). Vast differences in our sensory systems. Skin, fur, hair, scales, feathers, chitin, etc. of every color. Differences in reproduction, behavior, and many kinds of strategies.
Of course these are things that evolutionary theory has its own ideas about. But my point is - we MUST be the same to a certain degree to coexist within ecosystems. And when a certain body system "works" (like being able to see, or digest food) it is reasonable that it should benefit many kinds of creatures? Even so, those similarities always vary between groups of creatures. Yet if you consider how alike we may be to be "proof" of relationship, it makes even more sense (IMO) to consider how the extreme outliers who are very different came to exist? Sometimes there are extreme examples of differences between creatures that intermediary forms would suffer as they were "evolving" so it isn't reasonable to think that one could evolve from another.
I'm not sure if this helps? It depends on what level you are asking the question, which I should have asked first, but since I've written all of this I'll post it. Feel free to ask again if I didn't answer your question, and I'll try again.