We are not talking about how the diversity of the species formed. We are talking about how life formed. The theory of evolution does not explain how life formed. It only seeks to explain how already existing life evolved. The floor is yours. Explain how life came to exist and explain how your explanation is more valid than, lets say, theistic evolution.In terms of how the diversity of species formed, it's the theory of evolution. It's based on directly observable processes of changes in biological populations over time. This includes everything from how organisms reproduce, how genomes are replicated during reproduction, how changes to genomes occur via reproduction (genetic recombination, mutation, etc), how genomes form phenotypes, factors that effect population gene pools based on said phenotypes (selection, drift, etc), and so on.
Just to put it in context, your typical undergraduate textbook on evolution is anywhere from 600 to 800 pages long. And that's just to cover the basics. When you start looking at subsequent material, there are literally millions of publications to be found based on over a century of research, experimentation, observation, etc.
In contrast, the Bible has a few short passages that doesn't provide much beyond "God made some plants and animals". In terms of explanatory power, it's a bit lacking.
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