Synonyms for In the beginning:

adv

initially (adverb)
originally.
originally (adverb)
primitively, in the first place, to begin with.

adv.

all (adverb)
originally, primitively.
originally (adverb)
primitively, in the first place, to begin with.

n.

in the beginning (noun)
in the first place, earlier, primitively, to begin with, originally.