At the end of ואתחנן, there is a Pasuk that mentions that Hashem’s love for us has nothing to do with numbers. In fact, we are among the smallest of all nations.
Rabbi Soloveitchik points out that the Roman Empire considered making Judaism their official religion. Instead, Constantine chose Christianity. But Judaism was a definite option.
The same was true at the time of the formation of Islam, that Judaism was also viewed as an option. The Rav wrote that Judaism would not have been the same had the masses adopted it.
The details and intricacies of Judaism are reserved for a small, devout number of Jews. This was G-d’s plan. In Messianic times, things will be different. But for now, we influence even though we are small in numbers.