Wrinkled fingers

Do you think wrinkled fingers could be an evolutionary adaptation? When is it an advantage to grip things in wet conditions?

In my opinion, wrinkled fingers are an evolutionary adaptation of the mankind. From my point of view, all the features of the human being have evolved during the years. Then the question is what are the advantages of having wrinkled fingers?
When we spend much time under the water, we can see that our fingertips begin to wrinkle. So we can may (or might) think that this change will help us to work in wet conditions. Although I am not a scientist specialized in this stuff, I think wrinkled fingers have nothing to do with making our fingers better in those conditions. As I see it, our body is always adapting to different weather conditions, therefore we suffer many changes constantly. Some of those changes are important changes to ensure our life survival, and the other changes are side effects of the main changes. As a result, I can’t claim decide whether wrinkled fingers are to let us gripping things in wet conditions or they are just a side effect of other unknown and more important changes.

Excellent job Salva, almost perfect up until the final sentence! My corrections are in red and my suggestions to sound more natural are in blue/grey.

"I can’t claim whether wrinkled fingers let us gripping things in wet conditions" - There are several ways to rephrase this, based on the words that you used:

I can’t claim decide whether wrinkled fingers are to let us gripping things in wet conditions...

I can’t claim decide whether wrinkled fingers are for gripping things in wet conditions...

I can’t claim decide whether wrinkled fingers are for letting us gripping things in wet conditions...

If you want to use "claim", you can't use it with "whether" in this context. You could say: 

I can’t claim whether that wrinkled fingers are to let us gripping things in wet conditions, because maybe they are just a side effect...