If God didn't design DNA and RNA (nucleic acids), then why only up to 7 substances can compose them?

If it rained on Tuesday, why are brick houses made of brick? People will go to any extreme to rationalize their religious doctrines. You're threatened with eternal torture if you don't. Actually, DNA and RNA are composed of only five things, hydrogen, oxygen, carbon, nitrogen, and phosphorous. No, wait, only three things: protons, neutrons, and electrons. No, only two things, electrons and quarks. Well, make that three: electrons, up quarks, and down quarks.