Is the Islamic religion polytheistic?

Just so, is Buddhism a polytheistic religion?

Buddhism flourished in different countries, and some of those countries have polytheistic folk religions. Buddhism syncretizes easily with other religions. Thus, Buddhism has mixed with the folk religions and emerged in polytheistic variants (such as Vajrayana) as well as non-theistic variants.

Secondly, what does the Quran say about polytheism? In the context of the Quran, the particular sense of "sharing as an equal partner" is usually understood, so that polytheism means "attributing a partner to Allah".

Then, is Islam monotheistic?

The concept of ethical monotheism, which holds that morality stems from God alone and that its laws are unchanging, first occurred in Judaism, but is now a core tenet of most modern monotheistic religions, including Zoroastrianism, Christianity, Islam, Sikhism, and Baháʼí Faith.

Is there a religion that believes in all religions?

Omnism is the recognition and respect of all religions or lack thereof; those who hold this belief are called omnists (or Omnists). The Oxford English Dictionary (OED) quotes as the term's earliest usage by English poet Philip J. Bailey: in 1839 "I am an Omnist, and believe in all religions".