Old Testament scholars often refer to the
religion of the Hebrew
Bible as "Yahwism", because Yahweh is the center of this
religion, and the name "Yahweh" is used throughout. During the time between the Testaments, Judaism developed, wherein Yahweh is worshipped, but His name is not pronounced as a way to avoid saying the name in vain. Hence the Yahwistic "Yahshua HaMashiach" versus the Jewish "Yeshua HaMashiach".