IF GOD IS LOVE, WHY DID HE LOVE TO SHED BLOOD IN THE OLD TESTAMENT

In the Old Testament animals were slaughtered to make sacrifice to God as burnt offering, in the New Testament animals were no longer used as burnt offering/ sacrifice. Jesus Christ shed His blood for our sins. My question is why is God interested in shedding of blood?

Answer

1 John 5:8 the Spirit, the water, and the blood—and all three agree.

When Man fell, Man was Dead to God. This is a Principle we must understand to get the whole picture. All through Scripture (particularly the Old Testament), God spoke of Life in 3 Symbols of Life. 

They were Water, Blood, and Spirit.

This revelation was shown to the Apostle John in 1 John 5:8. So the period after the fall of man all through to the birth of Jesus, Man was unable to witness to the Life i.e. Eternal Life or Kingdom Life. He could only witness to Eternal Life through those 3 elements.

So we saw this witness occur when God used a man named Noah to purge the world with Water. All living things were immersed and submerged in Water. This was God witnessing to purification of Life through Water.

We also see a major witness to Life through the Blood when God killed the first born sons of the Egyptians and spared the Israelites because they covered their house with d Blood [of lambs]. Jesus also came as the "Spirit" became Life in d womb of the jewess, Mary. And so we see God was trying to earn completion and not just take people's lives or see blood as some sort of "divine vampire". 

God is the Ultimate Chancellor of the Institution of Eternal Life. He knows exactly what creates the order of Life and that was what He was trying to fulfill in Jesus Christ, through his Life (after Baptism in Water), Death (Blood on the Cross), and Resurrection (Newness of Spirit). This is the holistic picture.