Questions, part 2

Question of the day: Why the ritualistic prayers 5 times a day? Jews didn't have to do this, and neither did Christians, so why the change in prayer strategy? Did God just decide that people forgot about Him too much, and so this was what He had to do to get people to remember Him? Or was this just one of that parts that was "changed" in the Torah and the Bible? The Bible says not to pray with repetitions, and the prayers in Islam are very repetitious. I can understand that the point of these prayers in Islam is not so much to communicate with God as it is to just remind us to focus on Him, but I just don't understand why there was this new command of 5 prayers at specific times each day.