Careful research and reading with an open mind should show that the trinity,
the concept of one 'god" being really 3 gods in 1, pagan in origin.
The early Holy Roman Catholic Church embraced the idea that Catholics
could replace pagan concepts to convert pagans to the Catholic religion.
The R.C.C. merged pagan idols & concepts with "christian" idols and concepts, such as the cross, the egg and rabbit, (Easter) symbols of pagan fertility rituals, and many, many, more pagan images,( holloween is simply devil worship)
with "christian" images and ideas to convert pagans. This method of merging
paganism with christianity ( the R.C.C.) also avoided creating a void in pagan worship, replacing pagan worship with R.C.C. christianity.
Converting pagan peoples enabled the R.C.C. to gain more Catholics and increased
funding by taxing by means of "tithing" = mone = power for the R.C.C.
See: