Theists ask me a question

[dyresand]

Evolution has evidence of it happening we can look at our DNA animal DNA and look at both. 
Believe it or not everything on this planet, past future or even present is all related. All life on earth
shares a common ancestor of sorts we can look at tree and biologically speaking that is pretty much a very distant
cousin. Dogs and cats too are closely related ironically. I don't really need to prove it as there is so much evidence
for it you could pretty much go to google i'll even give you give you a video. 
https://www.youtube.com/watch?v=lIEoO5KdPvg

I've seen that video and honestly its pretty convincing. However, it focuses only on the very clearest 'evidence' there is, as if more were not needed. I accept the fact that we do not and cannot know everything, such as the amount of change that can occur in one species due to natural selection and mutation, however the video claims to have found many fossils of a transition between dolphins and legged land animals. I am not convinced by this claim, as it is only a very small part of what would be required to prove the theory of evolution. Perhaps it is not evidence of evolution, but merely diversity of kinds?
Lets start from the beginning - can you prove that the big bang created everything we see today?

Sure look at the flu virus every so soften it mutates so does everything else. Look at bacteria 
there is bacteria that becomes immune to antibiotics. This  is just going down to something more simple
on the biological scale. But viruses and other things evolve to counter act medications. This is why every
every few years a strain of the flu comes out and it becomes a issue because well the flu shot you get is only
for 1 strain the flu and not the others.