No, God does not need our rituals. They are our way of staying connected to HIM. The Christians and Moslems, who together make up almost 1/2 the population of the world, also believe in the revelation at Mt. Sinai. The communists tried to run an atheist society and failed miserably. Millions were killed in cold blood, starved to death, or were oppressed. If you strip the Torah (what you call dogmatic rituals) from Judaism there is nothing inherently Jewish left. Matzo balls and borcht (traditional "Jewish" foods in Eastern Europe) are not the building blocks of "Jewish" culture. It is the Torah, and only the Torah, with its doctrines of monotheism and its ethical precepts that are the "Jewishness" of Jewish culture. Gabriel, I challenge you. Plumb the depths of the Talmud, revel in its logic. Analyze a chapter of Shulchun Aruch (the basic code of Jewish law) and you can see for yourself the beauty of Torah. How can you reject something with which you aren't entirely familiar?
Islamic State militants blow up ancient Arch of Triumph in Palmyra (Reuters)
from the article: Shahar Ilan / Ultra-Orthodox parties are Judaism's greatest enemies