there are religions that are perfectly civilized and humane such as catholicism, christianity and judaism, but religions such as muslim where they have so many strict rules and twisted believes is where it crosses the line.
also religion didnt start WWI or WWII. WWI was started from the assassination of Archduke Franz Ferdinand in Sarajevo on June 28th, 1914. a man by the name of Gavrilo Princip of the Black Hand in Austria-Hungary committed this crime. so began the first invasion of Austria-Hungary into Serbia. at this time, Germany also invaded Belgium because they wanted that land.
WWI was started all around the assassination and then became a world war from allies on each Allied and Central powers.
WWII however, was started from the treaty of versailles. this is a document signed by germany on the terms of their defeat on WWI. the terms were far too harsh for Germany (ie. they had to pay for all the damages and repaires caused by WWI). this brought germany into a great depression, thus the rise of Adolf Hitler. he began preaching to the germans that he had a way out and that he could save germany from its economical depression. since no one else would take control of the country, he assumed power (dictatorship). he also managed to brainwash half his population into hating jews and cripples and other related disabilities. hitler formed his army of nazis which then began WWII by the invasion of Poland, where they were also looking for the land. because of this, france and brittian declared war on germany. at the time, germany was allied with Italy's Mussolini and Japan. These 2 additional nations also joined germany in defending themselves against Brittian and France. When they came in and it became too much for brittian and france, the solviet union and the united states aided the allied power.
so there you have it. religion did not cause the two biggest wars the world has ever seen. religion is only the cause of conflict in the middle east because the israelis and pakastanis just cant seem to get along and be friends.