@Ash_Kvetchum @Xenophon @xuya @BowsacNoodle @Frondeur @Gab_Refugee @justnormalkorean I do not get the first part about Enoch, Noah, and Christ, sorry.
You present a lot questions together, many of which could be considered as apparent contradictions. But when in doubt we are to look for answers in Scripture and Tradition and be very careful with following our own suppositions.
There is a lot, I will focus just on the first part I understand, it would take too long to answer so many old questions here.

About Jesus and Isaac and being the "only son".
It is not prudent to affirm that Jesus had half-siblings.
The word used to refer to Jesus "brothers" in the original text is “adelphos” (ἀδελφὸς), Which is translated consistently throughout the Bible as “brother” or “brothers”. But which meaning is not only referring to blood related brothers but also to half brothers, mate, friend or fellow members.
As demonstrated by 1 Corinthians 15:6 where it speaks about 500 "brothers" “adelphos” (ἀδελφὸς)
"After that, he was seen of above five hundred brethren at once; of whom the greater part remain unto this present, but some are fallen asleep."

And the word "μονογενῆ" used also of Isaac is, as you say, rendered many times as "only begotten son" but also simply as "only son". We know Abraham casted the slave woman and Ishmael away, as Sarah told him "Wherefore she said unto Abraham, Cast out this bondwoman and her son: for the son of this bondwoman shall not be heir with my son, even with Isaac." (Gen 21:10) and God confirmed to him the same thing: "And God said unto Abraham, Let it not be grievous in thy sight because of the lad, and because of thy bondwoman; in all that Sarah hath said unto thee, hearken unto her voice; for in Isaac shall thy seed be called." (Gen 21:12)

After casting Ismael away, Isaac was his only son left, in whom his seed should be called. (his seed should NOT be called in Ishmael) So the word "μονογενῆ" (only son) is rightly used there.

We can speak about the rest of the questions later, in truth they have been answered many times already, and many centuries ago.

But I cannot resist to answer the part where you say "It is not your goal to be saved" and "you are already saved". Because I find those very contrary to scripture and tradition.
"Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling." (Philipians 2:12)
I bet the Devil would love for us to believe we are already saved no matter what.

I ask forgiveness in advance if my language is perceived as too direct or maybe even aggressive to anyone, I tend to speak boldly about these things, it is not my intention to offend.