You choose your religion on a daily basis or we wouldn’t see anyone ever convert from one to the other.
People have agency.
People have agency.
And that’s before unraveling whatever the OP of this comment chain meant by Muslims and Christians are only fighting because of colonizers when Islam and Christianity were colonial ideologies in the first place with there emphasis on converting all of humanity.
At this point, it is indeed still a choice, but hardly a daily or conscious choice.
Renouncing/converting exists but is rare, life changing, and sometimes dangerous.
Do you change your worldview daily, on the level of opting in or out of religions? Do you think most people do? Do you think we can expect them to?