Because The Church can only serve one master. LBJ as a senator pushed through a bill to silence the churches political dissent in exchange for no taxes
You are wrong. The churches already had a tax exempt status. What LBJ did was slip in an amendment to the tax bill when very few were paying attention that made it illegal for entities receiving tax exempt statuses could not engage in politics.
He did so because he was facing re-election to the Senate and was being aggressively opposed by two non-profit anti-Communist groups that were attacking Johnson’s liberal agenda. In retaliation, Johnson inserted language into the IRS code that prohibited non-profits, including churches, from endorsing or opposing candidates for political office. In effect, Senator Johnson used the power of the go-along Congress and the IRS to silence his opposition
Unfortunately, religious organizations were clueless of what he had done until a few years later when the IRS began enforcing the little unknown rule he had slipped in.
However, religious organizations had been enjoying tax exempt status for well over 100 years already. read for yourself.
The History of The Johnson Amendment of 1954 You got me on a technicality LOL. But it did accomplish much damage and today still does. Much of the attacks on the church came from a movement brought to the U.S. in the 1930’s from Germany. It changed our government, family structure, churches, and our freedoms. Johnson's policies as POTUS increased the speed of the fall.