A pretend religion is one that has only just come into existence which has a relatively small following. In time, (tens of years, perhaps hundreds of years) if the following has grown into the millions, hundreds of millions then it will be classified as a 'real' religion.
The principles, the beliefs, the texts which underpin that real religion will be exactly the same as the pretend religion.
Both pretend and real religions will be based on a load of unprovable clap-trap with the 'mature' religion believing it to be superior to all other religions and will have generated a following of sufficient magnitude as to want to start a war in order to dominate, control and suppress followers of other religions.
And so the cycle of life, the universe repeats....