Actually, the British military during the American Revolution in real life didn't do that. This concept of burning down a church with innocent people inside in the 2000 film The Patriot was borrowed by the Nazis who were mostly famous for burning down villages and towns full of civilians during World War II.

With that said, there is massive evidence that the British military committed atrocities against American colonials during the American war for Independence in real life. For example, the British military treated colonial militias as criminals because they took up arms against the queen. Because the colonials were subject to the Kingdom of Britain at the time, they would have rightly be treated as traitors and denied POW stats. American militias who were captured by the British were often given harsh treatment and denied access to food and medical aid. The worst nightmare for American POWs was the prison ships. Prison ships were overcrowded and dirty and British guards often routinely beat American POWs for the hell of it. An estimated 10,000 American POWs died from neglect and brutal mistreatment in British prison ships during the American war for Independence. https://en.wikipedia.org/wiki/Prisoners_of_war_in_the_American_Revolutionary_War

In the aftermath of the Battle of Waxhaws, British troops bayoneted to death 113 American troops who had surrendered. The British also massacred nearly 200 sleeping Americans, including those who surrendered, during their raid on the town of Paoli, Pennsylvania.

What the British did to American soldiers of the Chasseurs-Volontaires de Saint-Domingue after capturing many of them following the seige of Savannah, GA, in 1779. The Chasseurs were a regiment of 10 companies of free colored men recruited on Saint Domingue (today Haiti and Santo Domingo). I emphasize FREE colored men. After the fall of Savannah to the British, the Chasseurs on land and those aboard three transport ships in the harbor were not treated as POWs, but as properties of war and were all sold into slavery by the British. Now that is an atrocity if I ever read about one. So much claim that the British hated slavery but instead use them as a desperation to fight the colonials, not acting out of heart.

There are plenty of British atrocities to come around with if you look it up more in the internet.