The First Amendment guarantees freedoms concerning religion, expression, assembly, and the right to petition. It forbids Congress from both
promoting one religion over others and also
restricting an individual’s religious practices. It guarantees
freedom of expression by prohibiting Congress from restricting the press or the rights of individuals to speak freely. It also guarantees the right of citizens to
assemble peaceably and to petition their government.
Here is a hypothetical example.
I own a Christian Church. Okay,
I don't allow a Muslim cleric to speak to my congregation.
I'm limiting his ability to be heard, but not limiting his ability to speak. I own the space and have the right to control it.