Lots of people vastly more knowledgable than you disagree and find it quite consistent.
You’ve just decided to ignore every part of the Bible that doesn’t agree with your view.
As already mentioned on several occasions, Jesus specifically said that all the laws of Moses had to be adhered to which amongst other things mandated all the horrible things you keep attributing to Muhammad, i.e. slavery, the killing of heretics and unbelievers etc.
You’ll notice how many theologians who are to this day viewed as the best and most distinguished Christian theologians believed this. Thomas Aquinas and Saint Augustine being the big examples.