Well the Lines and Writing on some of the Head Statues have to have some importance.
We have to look at Earth Cultures for similar things, in which some tribes Marking (Scars) and Tattoos on the Face are used to mean a number of things, depending on the Culture/Tribe but they are all to Symbolism the Importance of Ritual, for some they are a sign of coming of Age, or a Right of Passage, some they are to Ward off Evil and Offer Protection but i am not sure this fits with what we see in Prometheus/Alien Covenant.
They could be to mark beings of higher Importance, looking at the whole purpose in Prometheus/Alien Covenant it appears to be a reminder to those who encounter these Statues about the Purpose of Origin, Sacrifice and so to show case the Bravery/Sacrifice and Role of these beings in the Creation/Evolution of their kind.
As far as the whole GOD/Jesus and Father/Son i think we need to not read too much into One Culture, but it is important to consider the relationship of the Sacrificial Scene.
From Alien Engineers, the idea was there was this Ancient Race who have Evolved and Engineered themselves past the need to Procreate, and are able to Live very Long Lives, they are not IMMORTAL but due to Genetic Engineering they indeed have Vastly Greater Life Expectancy and do not (i assume) suffer from many Diseases and Disorders that can have a Drastic Effect on the Life Expectancy of a Human.
Doing this came at a Cost, as it meant the Race had then lost the Ability to Procreate, as there was less need for it. Such is the Cruel Nature of Evolution, and Price.
So the Sacrificial Scene was a attempt for this Race to Rectify this, having lost the ability to Procreate they had to come up with more inventive ways to Seed/Create Life.
This changed a bit with Prometheus, and Ridley Scott said these beings could create life in other ways, and the Sacrificial Scene was just the way they chose to do it.
so its all pretty open to debate really, as far as the whole Purpose of Creation etc, as we can clearly see those beings on Planet 4 have Females.. but the Question is is this via the Sacrificial Scene, and so if we go back to the time of the Sacrificial Scene, was there any Females on Paradise?
Who knows.. my personal theory is they attempted to use the Sacrificial Scene to eventually allow for the creation of Females so they then can breed with these and so Break the Curse of not being able to Procreate.
So i think Child Birth and Females are very important to the Engineers, and this could explain why those beings on Paradise look a bit different, they are in effect Hybrids.
This also i think explains why the Engineers on LV-223 held the Life-Cycle of the Xenomorph Related Organisms in High Regard, as it was another way these beings could Carry and Give Birth to New Life.... a Perverted Pregnancy of sorts.