Re: Timeline branching going forward *spoilers*
Also "Parallels" quite explicitly demonstrates the existence of alternate timelines.
But it also explicitly demonstrates the possibility of traveling between them, which in Orci's interpretation of multiverses isn't possible. In Trek, that is. Fringe is a whole different story.
"Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines."
― Bertrand Russell