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.
Not conspiracy with bitcoin and no one can't take manager and control with bitcoin price, government have big power but can't control how bitcoin price at the future, they only can get access for legal or illegal bitcoin as transaction or investment assets, but government never have power how to make bitcoin have price based on their mind and take bitcoin to lower price.