Some people fear that if gay people are allowed to marry then it will undermine the very institution of marriage. This however is not true, as the whole concept of marriage is that two people who love each other bond together forever. A large percentage of straight marriages up to 40% end in divorce, but in gay marriages it is as low as 5.4%. Marriage is suppose to be forever, and lower divorce rates means more successful marriages.
Now some people use religion to attack LGBT marriage. Some Christians believe that God created man