First: Congress can change the law by amending the Constitution. That is the only way to overturn the SCOTUS.  It is, I grant, difficult.

Second: While Congress may not be able to outlaw abortion, short of amending the Constitution, Congress does not have to vote for policies that enable abortion, encourage abortion, etc.  There are things they can do to restrict abortion.  

Third: When "Catholic" politicians call themselves "Catholic" but support abortion, (Biden, Pelosi, Kerry, Kennedy, etc) they need to be called out and held accountable. They cause scandal to the faithful.  The faithful might think it is acceptable to hold positions contrary to the faith.  Whether or not they can do something about abortion--they support it.  Their support of abortion is the issue--not their power to change it.  Why?  Because they support abortion. That means even if they had the power to change things they would not.  That also means they would not support pro-life judges.