Good passages, fits perfectly, there's just one thing which I've to correct, because it's a common misunderstood.

You and the holy scripture say "nobody can separate us from God", well, that's true IF we stay by God, so we're the only ones who're able to separate us from God, because we've the free will.The bible warns more often to decrease from faith is possible, so passages like "Matthew 7:13-14" are directed to believers, not unbelievers and I think "Hebrew 6:4-6" is the most important one which shows, how important it is to be loyal to the Lord and what happened when humans separate themself from God without to have the possibility to come back (wolves in sharpskin can seduce with false teachings to abandoned God).

Hebrew 6:4-6 It is impossible for those who have once been enlightened, who have tasted the heavenly gift, who have shared in the Holy Spirit, 5 who have tasted the goodness of the word of God and the powers of the coming age 6 and who have fallen[a] away, to be brought back to repentance. To their loss they are crucifying the Son of God all over again and subjecting him to public disgrace.