The two greatest commandments in the Bible are
1) Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
2) Thou shalt love thy neighbour as thyself.
Question: Is it possible to love your neighbor as yourself if you don’t love the Lord your God?
To a certain degree I think the answer is “yes.” Inherently we love ourselves. Even the heathen love their friends and family, even they know how to give gifts.
But I do think it is impossible to love your enemy, who may be your neighbor, without loving the Lord.
We love Him because He first loved us. When we see that while we were yet sinners, Christ demonstrated His love to us, we see that loving your enemy is something God does regularly and we were that enemy.
If we are at all impressed with this, it will show in our ability and desire to love even those who hate us, just as God did/does. Just as forgiveness is to be demonstrated by the forgiven sinner, so to is love.
You can surfacely love your neighbor apart from love of God, but I do think loving your enemy is purely Spirit-filled territory.