Muslims worship the one god - God. In Arabic the word for God is Allah
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Sirens were mythical but many state that these beings did at once exist.
Yes, the Muslims do exist, and in a large majority as well in many parts of the world. The question needs clarity.
Yes, Islam is for all human beings. It invites all human beings to come to its fold. Any person belonging to any religion may embrace Islam. Anyhow, one may take many years to study Islam and embrace it. There is no compulsion. Once a person intentionally, of his own accord, without any outward pressure accepts Islam, he is not permitted to withdraw. No one should make a mockery of Islam.
Yes, Islam is for all human beings. It invites all human beings to come to its fold. Any person belonging to any religion may embrace Islam. Anyhow, one may take many years to study Islam and embrace it. There is no compulsion. Once a person intentionally, of his own accord, without any outward pressure accepts Islam, he is not permitted to withdraw. No one should make a mockery of Islam.
The Muslims didn't introduce any particular food. Human beings had been eating many kinds of food before Islam. Islam just prohibited certain foods, declaring them Haram-Unlawful in Islam.
If you mean spiritual personalities they are many in number. They had been in all ages. They are still there in this age. Some of them may be still living in your area. All the Suhaba R.A.u were spiritual beings.
The total population of the Muslims is about - 1, 58, 0000000. Anyhow, any person of the world may study Islam. It is for all human beings and for all ages. Its study is not restricted to the Muslims only.
Fairies, much like angels are inter-dimensional beings who live in a realm between realms. Fairies are very much real spiritual beings, just as angels are real spiritual beings. Both angels and fairies are spiritual beings of the light, but they exist at different levels of vibration.
Muhammad was commanded by Allah (God) to narrate the words that would later build up into Islam's holy book, the Qur'an in the year 610 AD.
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It can be called Cryptozoology, Demonology (cuz angels exist, demon = fallen angel), or Anthropology of Supernatural beings. Cryptozoology is the study of fabolous creatures. Demonology I am guesing is the like Ghost Adventures type guys Anthropology is the study of human beings so Anthropology of Supernatural beings would be like Cryptozoology in many ways.
according to Islam God created human and universe to God be known. God has many attributes. human can not know the entity of God and only can know God by attributes of God. an attribute can be known only when its opposite exist. for example if cold not exist warm has no meaning so God created evil to good (attributes of God) be known for each good there is an evil Islam says evil actually not exist and evil is absence of good