What is the ruling on a man marrying a man and a woman marrying a woman in Islamic law, and what is its remedy?

This phenomenon is a deviation from religion and sound human nature, a destruction of morals, and a stripping away of the meanings of humanity. Its ruling in Islamic law is well-known. Whoever among Muslims does this, deeming it permissible, is an apostate who has left the fold of Islam. The remedy for this is to return to Islam, its teachings, and its morals.