According to conspiracy theory, Is it possible that the bitcoin was created by governments to gain financial strength in the modern world?
Which conspiracy theory are you pointing out? People who know bitcoin know that it is Satoshi Nakamoto who invented bitcoin but as to his personal identity, it is still unclear until now if he is a real person or just a pseudonym which is a person behind famous digital currency called bitcoin. If it is to strengthen financial aspect of the modern world, I doubt it because until now banks and governments are still against wide adoption of bitcoin. just my opinion.
Possible if government want to create their own cryptocurrency but never have to control about their coin created, just running how price control by seller and buyer, supply and demand will give opportunity how government coin become lower or higher price, but government have serious for listing with good exchange market after coin success sold to public.