Just ask one or more of the following questions:
How did humankind know that God’s design for marriage was one man and one woman for life before the Bible was written?
How do non-Christians know that today?
Was same-sex activity sinful before Moses wrote the first four books of the Bible? Why or why not?
If you believe it was sinful what, if any, Bible passages could be marshaled to support your position?
Is it necessary to believe in the inerrancy of the Bible in order to support a traditional view of marriage? Why or why not?
Is it possible to support a traditional understanding of marriage in the public square without using the Bible? If so, how might someone do that?
