Your prophet was the worst warmonger of his time....so you can keep your advice!
Wrong. Prophet Mohammed fought only those who transgressed on him and on his companions, and they killed some of them and tried to kill him, and so he fled them; then when he escaped to Medina city, God allowed him to fight those who transgressed on him.
While Prophet Moses ordered his people, according to God's command, to fight the Canaanite and settle in their land: those who had not started to fight him, but only because they were idolaters worshiping idols,
Moreover, there were many prophets who fought the idolaters, like Joshua son of Nun, King Saul, Prophet and King David, Solomon and others and that was according to God's command.
If Mohammed is truthful in his prophet-hood, then why did he use war and fighting in his mission? [: the Jihad or Holy War]