Brian Brown, president of the National Organization for Marriage (NOM), on Monday condemned a Supreme Court decision not to hear appeals in cases challenging five states' bans on gay marriage.

By refusing to review the cases, the high court allowed to stand lower court rulings striking down bans in Virginia, Oklahoma, Utah, Indiana and Wisconsin. The decision also affects six additional states – Colorado, Kansas, North Carolina, South Carolina, West Virginia and Wyoming – overseen by the same appellate courts, effectively increasing the possible number of marriage equality states from 19 to 30, plus the District of Columbia.

(Related: Colorado AG John Suthers orders clerks to begin issuing marriage licenses to gay couples.)

“We are surprised and extremely disappointed that the US Supreme Court has refused to grant review of the same-sex marriage cases pending before them,” Brown said in a blog post. “This is wrong on so many levels.”

“First, the entire idea that marriage can be redefined from the bench is illegitimate,” Brown said. “Marriage is the union of one man and one woman; it has been this throughout the history of civilization and will remain this no matter what unelected judges say. Second, it's mind-boggling that lower court judges would be allowed to impose the redefinition of marriage in these states, and our highest court would have nothing to say about it. Third, the effect of the lower court rulings is to say that a constitutional right to same-sex ‘marriage' has existed in every state in the union since 1868 when the 14th Amendment was ratified, but somehow nobody noticed until quite recently. That's the absurd belief we are being told to accept.”

Brown insisted that his group was not “defeated or dispirited” and called on Congress to “move forward immediately to send a federal marriage amendment to the states for ratification.”

“[W]e are determined as never before to fight for the institution that God created and humankind has proven is the best arrangement for the well-being of men and women, for children, and for society as a whole,” he added.