While I completely disagree with the inanity of the original cause and bumper sticker above, I do think that this is the best way to present religious freedom as an effective argument for why we need "a federal First Amendment Defense Act, or state government non-discrimination act ... pastor protection act ... etc."
There is no way that the liberal activists can claim they are peacefully co-existing ... just ask cake bakers, pizza shops, wedding photographers, pastors minding their own business in their own churches, quoting from the bible ......
The problem is that it downgrades the influence of religion on society as it was viewed by the Framers of the Constitution. The Framers viewed the influence of religion and morality as essentials to liberty. Where we are now is, we are fighting to keep the first amendment religious freedom as something merely tolerated at best, punished and even outlawed at worst. Our rights no longer come from God. They come for the SCOTUS.