The claim that we are all children of God is equivalent to Satan & the demons claiming likewise on the account of “birth, being created by God too”.
Fact is, all creation is His children initially but also became His enemies on account of sin.
Therefore, only by the Work of Christ we are “adopted in” into being “His children again” thereby eliminating the enmity which arose due to our transgression (such as serving created things as a god & other sins by breaking His commands).
Truth is, something is false or wrong whether we do it knowingly or unknowingly (which can only affect a lighter or heavier punishment accordingly but “not” its cancellation unless one repents & turns to Christ instead).
Therefore, think wisely and choose for yourself whom ye may serve this day itself.
Please don’t be deceived by shallow statements which can easily be refuted with truth.
The same God Who created your loving mother also created the most cruel demons. So, don’t think that God “won’t” punish sin fairly.
Also, don’t be too confident in you “being a child of God” (on account of creation) because those demons too are similar to you on this regard. It’s “no” big deal to realize this.
Crudely put, when you disobey God beginning with not believing in Him,
“you are no more a child of