Without religion humanity wouldn't be aware of its spiritual nature, eternal destiny, and/or moral guidance from the beginning of time.
Yes, the concept of religion, which includes beliefs and practices, is ultimately created by mankind.
Religion is a creation of mankind, therefore it would cease to exist if man were no longer here. If animals got smart enough then sure.
Which religion? There are hundreds practiced today, thousands throughout mankind's history.
It depends on the religion.
As all people of mankind was created.
The person who wrote that evidently thought that religion is harmful for humans - that it enslaves them.
It is the native religion of Japan and was once its state religion.
Judaism did not begin within another religion.
India
Polytheists.
Islam
About 550BCE