That's the two commandments.
I did a study on the New Testament commandments, and so you are preaching to the choir.
While we can love Jesus or God by loving our neighbor (i.e. helping the poor, etc.), there is more aspects to loving God in the 1st greatest commandment given to us. The full version of the 1st greatest commandment is found only in Mark 12:29-30. Mark is the least of the gospels and so that is why this command is found there. It is humble.
Paul says in 1 Timothy 6:3-4, “If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness; He is proud, knowing nothing,...”
This is saying that if anyone teaches contrary to the words of Jesus and the doctrine according to godliness, they are proud and they know nothing. Proud is the opposite of being humble.
James 4:6 says God resists the proud and gives grace to the humble.
The Bible mentions how we can overcome
sin (i.e. mortal sin) in Galatians 5:24, John 5:14, John 8:11, 1 Peter 4:1-2, Titus 2:14, 2 Corinthians 7:1, etc.
Jesus warned against committing certain sins with the threat of condemnation to our souls in Matthew 5:28-30, Matthew 6:15, Matthew 12:37, Matthew 25:31-46, Luke 9:62. Jesus agreed with the lawyer that to love God and to love your neighbor is a part inheriting eternal life in Luke 10:25-28.
So if anyone (even a believer) is not on board with these words of Jesus, those words will judge them on the last day. For Jesus basically said in John 12:48 that if anyone does not receive His words, those very words shall judge that person on the last day. In other words, they are not going to make it into God's kingdom because they went against God's Word in justyfing sin in how God's Word defines justifying sin and not in how they define it.
You said:
Believe in the death and resurrection of Jesus and love others as Christ loved us (unconditional love).
Do you believe you have to love as a part of eternal life?
Loving in action would be considered a work.
You said:
God is love and that is what the entire law ultimately proclaims, love from a pure heart.
The one that loves others without conditions attached, reflects Christ' love in a perfect way.
So the statement; my yoke is easy and my burden is light is fulfilled.
It is easier to love rather than to do sinful things. But I don't believe we are truly loving if we are not obeying Jesus (See: John 14:15, and John 15:10).