If grace was a doctrine, what you write, is true but I don't believe Grace is a doctrine, Grace is Jesus. It's not because of our doctrine we are His because if that were so, we would love our doctrine more than we love Jesus and we would be no different from any other religion. We are to believe not our doctrine, it could be wrong, but to just believe on the one whom He has sent, John 6:29 and at the moment of belief, John 3:7, the Holy Spirit moves in, John 14:16 and you will be sealed with the Holy Spirit, Ephesians 1:13, and you will have eternal life, 1 John 2:25 and this eternal life is what we hold onto, 1 Timothy 6:12. The promise God gave me is eternal life and I am the righteousness of God in Christ, 2 Corinthians 5:21 and this is our good confession, 1 Timothy 6:12. It's all about Jesus!
God showed His love by the Cross, 1 John 4:9.