Actually, Dr. Lurve, your question already presupposed the Marcionite Heresy, the belief that the Old Testament God and the New Testament God are different Gods. If this is your view, then you obviously have not read enough of either to see either God's mercy as he demonstrated it over and over again in the Old Testament, or the ways in which Jesus frequently pronounced judgment upon those who continually committed injustice and wrong. My suggestion to you is to actually go back and spend some time reading both the Old and the New Testaments and then see if there this dichotomoy of yours is justified.
But to answer the question, here is the God I believe:
Council of Nicea wrote:
I believe in one God the Father Almighty, Maker of heaven and earth, and of all things visible and invisible.
And in one Lord Jesus Christ, the only-begotten Son of God, begotten of his Father before all worlds, God of God, Light of Light, very God of very God, begotten, not made, being of one substance with the Father by whom all things were made; who for us men, and for our salvation, came down from heaven, and was incarnate by the Holy Spirit of the Virgin Mary, and was made man, and was crucified also for us under Pontius Pilate. He suffered and was buried, and the third day he rose again according to the Scriptures, and ascended into heaven, and sits at the right hand of the Father. And he will come again with glory to judge both the living and the dead, whose kingdom will have no end.
And I believe in the Holy Spirit, the Lord and Giver of Life, who proceeds from the Father and the Son, who with the Father and the Son together is worshipped and glorified, who spoke by the prophets. And I believe one holy Christian and apostolic Church. I acknowledge one baptism for the remission of sins, and I look for the resurrection of the dead, and the life of the world to come. Amen.
BTG wrote:
In reality, they are the same God. They are just presented differently.
By some people who stereotypically view the Testaments this way, but not by the Testaments themselves. Anyone who has actually studied both would know that the God of the Old Testament abounds in steadfast love and mercy.
(btw, I'm not slamming you, I'm just reiterating that this dichotomy is a false perception of many people).