Is there a reason our fingers are all different lengths from one another?, why not the same length on each hand?

If you are using a finger for picking your nose that is too long, brain damage could result.

It's evolutionary----human beings' hands evolved to used objects and manipulate things with great dexterity. Here's an interesting tidbit----the index finger on most men is often shorter than their "ring finger". This is the result of males' exposure to testosterone in the womb, and having more testosterone than women. Women's index fingers, on the other hand, are usually roughly the SAME length as their ring fingers, because of much less influence from testosterone.

God has given us an example of everything in our body. It shows all the children of same family are not same. Shatzee has given good answer as well in scientific way

Probably was the best configuration as we were evolving and, therefore, the best was the one to reproduce.

So That a big ol' fat diamond Ring will look better! lol...(sorry)

Better leverage

Equal fingers cannot make a fist as equal rank soldıers connot be comanded as a single unit!