Unsaved people can have measure of objective love toward one another. But at that point, the only way God could love us objectively was in our position in the Finished Work. This is not an experiential love where He initiates and we respond. His love was for us, and toward us, but it was subjective. There is no real response on our part until we begin to have a hunger and thirst for the Word of God.
Objective love is conditional, just as rewards are conditional.
Therefore, we must first develop a capacity to understand how much God loves us. He will always love us, and we will always be the objects of His love for salvation, but His all encompassing Alpha-Omega love must be imparted. When it is not imparted, then we do not receive the many benefits that are ours in Christ . Because objective love is conditional, its manifestation changes depending on the response of the object to the subject. If I have entered into an objective love relationship with God, by putting Him first and responding with God by putting Him first and responding to His promises, then I will experience His subjective love toward me.