Within Hinduism there are hundreds of gods, in Judaism, Christianity and Islam, there is one God and in Buddhism there is no God. Which religion is the right one? No one knows! No one has seen any of the gods. Or talked to any of them. No evidence exists for any single god!
Are they just superstition, bogeys?
The logical answer is: Yes!
Yet people, convinced that their faith in God is the right one, with great conviction murdered millions of their religious opponents. Famous examples of this are the battles during the French Wars of Religion and the Thirty Years War, when Catholics and Protestants fought. Another example is the Crusades with fighting between Christians and Muslims. In our time, it is the Muslim fundamentalists who wage war against all religions and also against Muslims who are not sufficiently radical as measured by their yardstick. Examples of these groups are the Taliban, Boko Haram, the Lord's Resistance Army, Al-Shabab, Hezbollah, Hamas, Al Qaeda, the Muslim Brotherhood and the Islamic State.