First of all we don't know that those are different species of humans
We always knew they were different species. But now we know they are different species of
humans.
Second, we don't know whether we really are related to some other species through DNA
That's exactly what dna can tell us. It was the absence of this evidence before that left doubt.
Third, if you can prove from DNA that we're related to some other species of humans then why don't they show from DNA that we're related to apes and fish and all those transitional species that are supposed to be there between fish and apes
Recovering dna from ancient remains is extremely difficult. It's only the last few years we've managed to get back as far as Neanderthals etc. We will certainly never be able to get it from millions of years ago.
You don't seem to be aware of how extremely unlikely it is that anything gets fossilised. Of all the species that have existed, perhaps just 1% have left any fossil trace (and that excludes most soft tissue species altogether). So it's like trying to read a book with only one in every hundred pages still surviving.
This means we can see broad developments, but tracing a single line of ancestry with certainty for an individual species is next to impossible. However, there are plenty of things we can see that are consistent with TOE but no other theory (eg the progressive appearance of key features such as bones, eyes etc over millions of years).
We do know that human beings were NOT made from apes
TOE does not say we are descended from apes. It says apes and man have a common ancestor.
We also know from hadith that the first humans were very large in size (70 feet height I think - and that is what a scientist also stated
There is no fossil evidence for anyone so tall. In fact it is impossible for a such a huge human to live on earth for other physical reasons (gravity etc). They wouldn't be able to move.
When you know that the first particle came from somewhere - before the big bang there was nothing
Why do you believe the astrophysicists but not the biologists? They're all scientists.
We also know from science that all humans came from one pair of male and female
Interestingly enough, we can trace a single common male and female ancestor for all non African peoples. However, they didn't live at the same time. (There were other males and females but their line did not survive to the present day.)