Can any created being, including demons or angels, separate us from God's love?
No. Paul writes that neither principalities, powers, things present, things to come, height, depth, nor any other creature can separate believers from the love of God in Christ Jesus. The word creature includes all creation—demonic or righteous angelic—so no created being has that power.
Les teaches from Romans 8 that the list includes principalities and powers, things present, things to come, height, depth, and any other creature. He explains that “creature” refers to all creation, so nothing ever created—whether on the demonic side or on the righteous, angelic side—can separate us or take us out of the love of God which is in Christ Jesus. Earlier he tied this to Ephesians, where the conflict is not against flesh and blood but against principalities and powers under Satan’s authority. Satan can frustrate believers and keep lost humanity in darkness, but he has that power only until God breaks it. Les also stresses that God opens hearts and the Holy Spirit gives understanding. He then turns to John’s Gospel to see what Jesus Himself said, since some dismiss Paul.
For I am persuaded, that neither death, nor life, nor angels, nor principalities, nor powers, nor things present, nor things to come,
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Why can nothing separate us from the love of God?
Because we were already His before anything was created, nothing can separate us from the love of God which we have in Christ Jesus.