There are countless loving relationships. Most of which are not, nor demand to be called marriage.<quoted text>
No two marriages are the same, just as no two people are exactly the same. Your belief ignores this reality. Yet you fail to show how all same sex marriages are different from all opposite sex marriages, other than the gender combinations.
While the law cannot make any two marriages equal to each other in all aspects, treating them equally under the law is a matter of basic fairness, fulfilling the spirit of our founding documents and constitution.
To identify with marriage you have to go to the basic essence and qualify at that level.
Marriage is a cultural constraint of evolutionary mating behavior. Gay unions are the exact contradiction of that behavior.
Gay unions are better identified with handicapped rights.