matter and antimatter?

"if electron neutrino flavor turns antimatter into matter"

It does not. Electrons and neutrinos can form muons (and vice versa).

"what if we find ways of turning off the electron neutrinos, then won't the universe create equal matter and antimatter?"

What if we could change the laws of physics, turn lead into gold, turn water into wine? "What if"s are not much better than opiates.

"if we make matter and antimatter and use it right away without trapping it, the atomic bomb is going to be obsolete?"

Why did you think of bombs? Why not interplanetary propulsion, heavy lifting to space, or even just power?

A few points to be made there:

* Scientists currently aren't sure why the universe didn't create equal amounts of matter and antimatter- indeed, that remains one of the biggest unsolved questions in science to date. If you figure out why it happened, you'd win the nobel prize.

* If we did find a way to make large amounts of antimatter, then yes, it would make weapons that were vastly more powerful than the atomic bomb. However, there is little chance of that happening at the moment. Antimatter is extremely difficult to make- it takes a multimillion dollar particle accelerator, and vast amounts of energy, to just make a single particle of the stuff. Making enough to build a bomb is essentially impossible with current technology, or anything foreseeable for the reasonable future.

the saying is half right. Matter can be converted into energy, and energy can be created into matter, but you cna't create matter from nothing nor.