Sadly, it seems an impossibly large step for most of us to love Him back, however (which just goes to show how bad we really are
)! In fact, had He not stepped in to stop it/stop us (by saving a remnant from among those walking on the road to perdition) ALL would have been lost/NONE would have been saved, whether they be Jew or Greek .. e.g. Romans 3:9-12.
Romans 1
20 Since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.
While we are without excuse for not believing that God exists, the 'condemnation' of those who remain outside of Christ is still based on three other things, 1. their knowledge and 2. their understanding of the Law (even if the only "law" that they know and understand is the basic one that is written on their hearts from birth .. e.g. Romans 2:12-16), as well then 3. what they choose to do in this life with the knowledge and understanding that they possess.
Did you mean to say, "a lot of good guilt would do if it COULD motivate seeking God's forgiveness"?
You know, that's what the Law actually does for us, yes? It motivates us (like a harsh schoolmaster .. Galatians 3:24) by telling us 1. what God wants and expects from us, and then by 2. showing us how badly we've missed the mark that He's set for us
~Deuteronomy
Romans 1
20 Since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse.
While we are without excuse for not believing that God exists, the 'condemnation' of those who remain outside of Christ is still based on three other things, 1. their knowledge and 2. their understanding of the Law (even if the only "law" that they know and understand is the basic one that is written on their hearts from birth .. e.g. Romans 2:12-16), as well then 3. what they choose to do in this life with the knowledge and understanding that they possess.
Did you mean to say, "a lot of good guilt would do if it COULD motivate seeking God's forgiveness"?
You know, that's what the Law actually does for us, yes? It motivates us (like a harsh schoolmaster .. Galatians 3:24) by telling us 1. what God wants and expects from us, and then by 2. showing us how badly we've missed the mark that He's set for us
~Deuteronomy

Re Rom. 1:20, you need to focus on God's moral nature as well as His omnipotent existence,
and it is because humans are created in God's moral image that they experience guilt when they behave immorally.
Re guilt, a more complete statement I mean is this: Unfortunately, some saints may not appreciate the process of spiritual growth or being transformed by the renewing of their minds (Rom. 12:2), perhaps because it involves admitting sins or having “guilt trips”. Guilt is like a warning light, and until we gain the wisdom to welcome God’s reproof, we will not feel the satisfaction of becoming a new and improved version of ourselves. Woe to the one who become so callous that no guilt is felt when wrong is done (Matt. 13:14-15).
And yes, guilt should occur when one disobeys God/GW/His moral Law, and God intends for it to motivate repentance,
confession and seeking His forgiveness in Christ.