Gay marriage is not marriage in God's eyes.
Genesis 2:23-24 And Adam said, This is now bone of my bones, and flesh of my flesh: she shall be called Woman, because she was taken out of Man.Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
Did you notice the words 'woman' and 'man'?
Mark 10:6-7 But from the beginning of the creation God made them male and female.
For this cause shall a man leave his father and mother, and cleave to his wife;
Did you notice 'male' and 'female'?
This thing the state calls 'marriage' is nothing but a highjacking of a bond that God had instituted from the beginning and then slowly twist and contort to their twisted thinking.