G-d Wants His Children to Follow Their Path

Question:
As a Rabbi, how do you explain the fact, that there are so many other religions, and only a tiny minority of the world's population believes in Judaism?
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Answer:
Jim, do you have brothers and sisters? If you do, I'm sure you'll agree, that each of you is different. One of you may be musical, another a sports freak, and yet another more academically inclined.

Each of you is an individual, and that should be encouraged.

It would be wrong of parents, to treat all their kids the same. If they would have forced you all to play violin, or soccer, or to read Shakespeare, it would have been counter-productive.

Good parents know, that each child has to be allowed to develop, in their own unique way.
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The nations of the world, are all G-d's children. He doesn't treat them all the same, because they aren't all the same. He wants each nation to develop in its own way. So each nation has a different path, to reach their full potential.

To the Jewish nation, he gave the Torah as our way of expressing our souls. But Judaism is not for everyone. We don't believe, that a non-Jew needs to become Jewish, to find G-d; just like a musically-talented child, shouldn't be forced, to play soccer.

Anyone can convert, but that is up to them.
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G-d created different nations, because each has a unique contribution to offer the world. Maybe your "mission" should be, to ensure that your nation fulfils its purpose.