It is: God is One without associate or son or parents .. God is the Eternal.
So you can be wrong in any political or social idea .. but this is the essential truth: the belief in God as One God without associate and in the Afterlife: the Next Life.
These are the last two ayat of the soora 42: 52-53, which mean:
(52. [Just as had We revealed to the prophets before you by a messenger out of the angels,] as such have We revealed to you [Mohammed by] a ghost [: Gabriel: the Trustworthy Ghost who is one] of Our am'r [: Our spiritual creatures.]
[Although before the revelation] you were not aware about the [heavenly] scripture and the faith.
But We have made the [Quran] a light, wherewith We guide those of Our servants whom We please.
And indeed you [Mohammed] do guide [people] to a 'standard and straight' way [of monotheism, which if they follow, will lead them to Paradise.]
53. The way of God, to Whom belongs [all] that is in the [ethereal] heavens [: the paradises], and [all] that is in the earth [as a whole.]
surely all souls [: lit. am'rs] will return to God [after death, and He will judge them justly.])
More explanation is in the link: