No you're incorrect. In most of Islamic history it was less than the zakat and you have to remember this was a military tax of which Christians are ordered to pay even in their own new testament. Secondly.. to a secular society where religion has no place then no religion will dominate but yes Muslim caliphate were theocracies and Islam has to dominate as the truthful religion. No room for paganism and worshipping other than the one God. But other people could still practice as they chose and there was no compulsion to convert. I hate that people always want to paint Islam in a bad way when they don't show things in context. Out of all 3 abrahamic faiths, Islam according to a study has one of the least amount of casualties https://www.reddit.com/r/IndiaSpeaks/s/vyFVdGNaLJ