Why does the Star of David represent the divine union of male and female energy?

Question

where the male is represented by the upper triangle and the female by the lower one. Moreover, it derives four triangular symbols from it (two triangles crossed like a capital letter A and two uncrossed) to represent the four elements: water, fire, air, and earth.
How does this tie into Judaism and why would they use an ancient astrological symbol to represent their great faith?

Answer 1

Well this is just a guess ;)
I bet there were into shamanism like the rest of the world and had to hide the fact to more "civilized" cultures