Dear Tnmusikman.The two Commandments which Jesus gave us, and made sure we understood, are easy enough to comprehend and remember. But best of all, they are straightforward enough to live by and imitate.  In fact, they are best explained and followed by, " Do unto all, as you would love to be done to:" lovingly and no strings attached.  As soon as we all understand this and live by accordingly, this imperfect world will become more and more perfect, and God will rule as our Worthy Heavenly Father.
As for explaining evil to non-believers,  we can only show the world by loving and caring, as God wants us to.  Love must become our only weapon to fight with, and Love for God must be so sincere, that every knee shall bow, and every tongue confess that God is our Heavenly Father.
I say this with love, Tnmusikman.  Greetings from Emmy, your sister in Christ.
The two Commandments: Jesus tells a Lawyer: St.Matthews, chapter 22, verses 35-40: 1) Love God with all thy heart, with all thy soul, and with all thy mind. 2) Love thy neighbour as thyself."  Then Jesus points out:
" On these two Commandments hang all the Law and the Prophets.