"There the many creationists web sites with supporting evidence,"
Uh, no. There are many creationist web sites claiming to have supporting evidence, but all they show is Bible stories and wishful thinking.
"but you will not believe them."
I would if the there was an iota of actual, verifiable evidence supporting creationism.
"However have a look at all the tests that are carried out by evolutionists and you will see ( if you are honest) that all their tests showsl that flies do not change into anything else but flies such like."
So, if I don't believe your fairy tale I'm dishonest? Plus, there are reams of evidence showing that lifeforms evolved from other lifeforms.
"You would have thought they would have been able to prove the theory by now, but they have not"
Complete and utter proof as to the details of every step of evolution is not possible, but proof that evolution happened and continues to happen is overwhelming. Proof of the Bible stories of creation is utterly non-existant.
The main problem here is that you wouldn't know credible evidence from a fairy tale if it wore a sign and introduced itself.