The United States of America is a republic. There is supposed to be a firm separation of church and state. With the 19th Amendment and the acknowledgement of the right to suffrage for women and the 14th Amendment acknowledging the right of African-American citizens to vote (along with other civil rights), the issues of gender and race should have been removed from the sphere of the governing of the republic.
The people who argue that the United States is a Christian country are ignorant of the fact that the USA is explicitly NOT one. Similar arguments can be made by the laws regarding who governs the nation. Socially, we see certain trends and those trends are sometimes argued to be supported by the laws of the land. As a result of such, things such as racism become deemed as acceptable in policy. We must adamantly resist this lazy logic.
When we permit the rights of one man be oppressed, we open the floodgates for the oppression of the rights of all. It seems to be a comfortable fallacy for people to say 'It doesn't affect me. I'm not one of those XYZ people." This forgets that much of the daily operation of our government is done on the basis of precedents. It is not the prevailing winds of public opinion that determines the shape of law, it is established precedents and logical developments upon the basis of them.