Acts 15 does not do away with God's moral laws that are contained within the 10 commandments, but it also shows not all 613 Mosaic laws apply to us. Walking in love for God and for others which are the 2 main commandments given by the Lord does not uphold all 613 Mosaic laws because they do not all apply to us.
Walking in love fulfills God's moral laws of not wanting to do wrong in own life and toward others, this does not mean we still uphold all of it as the punishments were done away with, sacrifices were done away, and so on.
then why start a new covenant. god would have left everything in place. you seem to think forgiveness is your gift, to mankind.
Isaiah 49: The Servant of the LORD
he says:
"It is too light a thing that you should be my servant
to raise up the tribes of Jacob
and to bring back the preserved of Israel;
I will make you as a light for the nations,
that my salvation may reach to the end of the earth."
and
God's Steadfast Love and Compassion
18 Who is a God like you, pardoning iniquity
and passing over transgression
for the remnant of his inheritance?
He does not retain his anger forever,
because he delights in steadfast love.Micah 7