Religious freedom is not possible without freedom of speech. Restrict freedom of speech in the area of religion, and religious freedom no longer exists. Islam is not interested in religious freedom, and the first step to removing religious freedom is to restrict religious speech. Textbook Publishers are not permitted to freely write about the true history of Islam because they know they will be threatened with legal, political, and violent reactions. The Constitution of the United States protects the freedom of religious speech under the 1st Amendment clause “and the free exercise there of.” Religious speech is part of the free exercise of religion. Freedom of Religion/Freedom of Speech: Sisters.