the term "rekigion" is referred to the faith, or beliefs and can be expressed as prayer, fasting, sacrificing etc
religion
The term, scientific religion, is an oxymoron. There is no such thing.
Non-theistic is the term used for any religion that does not believe in a god.
the term "stateless religion" is not a concept in Judaism.
The term "Hafeez" is suitable one.
The term Waheguru is used the religion of Sikhism. It is a term used to refer to God or the supreme being. It is used frequently is Sikh teachings and sermons.
A cult
No, (neither is Muslim for that) - Islam is the religion, Muslim is the foillower of Islam.
Apostates are people who formally renounce their religion and join another.
missionaries
There was not a Greco-Roman religion. Greco-Roman is a term which refers to art.
He is Muslim. Islam is the religion; the term Muslim refers to the people who practice Islam.