New Testament first, it gives you the meaning of how to live and be the salt and light of the earth. Old Testament is good too, once you understand what happened in the New Testament.
Also pray God will help you to understand, it is a living Bible which means you read a passage today that something will jump out at you and then you read it in a month and see something that didn't really hit you before. God Always Wins
Psalms 23 - Change that chapter to a prayer from you to God for 30 days, I did this and it changed my life. God will pour into you such understanding that there is no way you will question God's existence. Your heart will begin to understand God and His ways. GOD ALWAYS WINS
Love them anyway for one day they will understand.