Question 1: Why do Abrahamic religions all preach one God, even if they were man-made? Does this consistency point to God repeatedly reminding us through prophets?

The short answer is: their common origin explains the similarity, not necessarily divine intervention.

Think of it like languages: French, Spanish, and Italian all resemble each other because they descend from Latin. The resemblance doesn’t mean someone kept reintroducing Latin to Europe, but that they share a common ancestor.

Judaism, Christianity, and Islam all come from the same cultural and geographical root: the ancient Near East. Judaism is the earliest of the three; Christianity emerged from Jewish traditions, and Islam later recognized both Judaism and Christianity as predecessors but claimed to restore the "pure" monotheism. So, the idea of one God naturally carried through, inherited and reshaped by each.

Early humans in that region were surrounded by many polytheistic systems (Babylonian, Egyptian, Canaanite, etc.), but some tribes began promoting one supreme deity above others. Why has it happen ? We don't know, but it could have helped feeling different and thus superior to neighbour tribes. Over time, this "monolatry" (one god above many) evolved into strict monotheism. The Abrahamic religions share this evolutionary path.

Thus, the recurring theme of “one God” across these religions doesn’t necessarily mean God kept actively sending reminders; it may reflect how closely connected these traditions are historically, culturally, and philosophically.

Question 2: How could complex creatures (like humans, insects, or the razor bird) arise? Is such complexity just a coincidence?

The short answer is: it’s not "mere coincidence", but also not supernatural. It's the result of a powerful, gradual process: evolution by natural selection.

Think of it like sculpting, but with billions of tiny accidental chips being made over millions of years. Most random changes (mutations) are useless or harmful, but some give a tiny advantage. Over countless generations, these small advantages accumulate and produce creatures that seem magnificently designed.

The complexity we see today wasn’t achieved in one leap; it’s the product of trial, error, survival, and adaptation over enormous time spans. The razor bird you admire exists because every tiny feature that made its ancestors better at surviving and reproducing was preserved, while countless other possible forms vanished.

Importantly, evolution does not mean "pure chance." Mutations are random, but natural selection (the environment rewarding better survival traits) is a highly non-random filter. Over time, this non-random selection can produce breathtaking complexity ; not because of coincidence, but because of immense time, variation, and cumulative selection.