Why not? - If you accept we evolved (your above quote demonstrates that) then I'm not sure you know what you are actually talking about.
I think I was a bit too blunt with my statement, but how you percieved it is how you responded to it, so I dont blame you.

Let me elaborate, Evolution is called a theory because that is exactly what it is, it never called "evolution fact", because there are numerous question marks as to how we came about regarding evolution and how to prove evolution over such a long time scale.

HOWEVER, we can often see at small levels evolution taking place in the short term, such as animals adapting to their environment (this does not erase the question mark about our existence however) and evolving and improving into a higher formed animal which is more fit fore survival.

There have probably been many mutations in nature that simply were not fit for survival and do not exist today.

The question mark still remains on exactly how we got here, you cannot just see small animals evolving and adapting to their environment and apply that to your 4 billion year theory of evolution (a lot can happen in 4 billion years and there is a lot to prove such as how you turn a rock into a living organism) especially when you consider the fact that we have been on this planet for about 2% of its time of existence lol.

Scientists DONT hide behind anything - that's sort of the whole point.

Learn more biology - this is getting old.
Evolutionists do hide behind the time factor of 4 billion years.

How else do you explain how we turn from rocks into humans?

You say it took a very long time lol.