" they can't be a human being until they fuse. "

They aren't anything other than human and can't be a human being unless an awful lot of things happen.

" ...Stop digging."

Digging? I'm merely accommodating myself to your ever changing story which began with the claim:

"It takes a sperm and an egg to create life."

Which biologically of course is not the case. Life is a continuum: not an incidental.