Nonsense.  Holy matrimony may be religious;  marriage is a civil contract historically about the transfer of property from one man to another (father-in-law to bridegroom, or VV).  In this country, people are free to enter civil marriage contracts.  The Church can refuse to recognize these contracts as sacramentally valid, as it does with divorced people or gay people.   But it reognizes that in a civil polis it requires a co-existance.

Further, there are many faith groups who consider that divorced people and gay people can marry in their church.  It would be denying their religious freedom to prevent that.

Religious freedom must be distinguished from religious privilege.

This kind of remark is why the fastest growing faith group in this country is the "nones"...and why ex-Catholics are one of the largest.