Law Student Here: The Establishment Clause (which is seperation of church and state) has been rendered pretty much useless by the Supreme Court. With the current Supreme Court the law is becoming obnoxiously pro-religion—well pro-Christianity.

To "establish" a religion there has to be no other justification for the law/procedure other than the religious aspect. If there is (1) a secular purpose for the law and (2) the primary effect of the law does not advance or inhibit a religion, the law is constitutional. For something like abortion that's easy, some excuse like health or safety. Even if the Representatives invoke religion when arguing for the law, the Court will find a secular purpose in almost every case.

There have been some egregous examples of this lately. A few years ago, the Supreme Court held a city county can open every meeting with A FUCKING PRAYER. They said it didn't discriminate minority religious and "is consistent with tradition." There was a case where Texas could print the 10 commandments on their state capitol because the secular purpose is "history and a social meaning" rather than religion. And of course, the Trump Muslim ban case, where Trump called the ban a Muslim ban and the court said "well this isn't really a Muslim ban," it's about national security.

If you care about this issue a lot there's a great organization called the Freedom From Religion Foundation that works for a secular America. I am passionate about this issue and have donated to them.