We know the universe did have an origin.
No 'we' don't. But apparently you think you do.
Theologians believe it had an origin.
Astronomers, cosmologists, cosmogenists, physicists, et alii, all believe it had an origin.
May I inquire as to your particular (out of mainstream) view, and why? It would spice up this thread.
Sauron (Time to go home, people. Have dinner. It's 5:00 Friday!)