"lines were ever merged"
They merge in the Big Bang theory of cosmology. afaik, the BB is as unassailable as evolution. The question about BB is whether the universe will continue expanding infinitely, or will it stop expanding and collapse into another BB, ie, an oscillating universe.
fwiw, Vedantic thought, "intuitive knowledge", subscribes to the BB oscillation, and even says we are in the 40th cycle of BB's.
I like the oscillating BB theory, where that thimble-ful of matter just before it Bangs, and just after it collapses, is both the Alpha and the Omega. Damn, doesn't that ring Biblical bell somewhere.
