The OT is filled with God's wrath and anger, yet the NT takes a new turn in love. Now I fully believe God was still full of love as more shown in the NT, but why was there so much anger before and not so much now? He tells us the dangers of being angry but psalms 2 speaks of His own anger.
Anyone give me some insight on the idea that YHWH becomes angry and how can this anger be taken, considering our Father tells us not to be?
We are made in God's image, not he in ours. The result of this is that there are similarities between us... but at the same time it can be dangerous to try and understand God in terms of us.
God has anger, and we have anger.. but the reality is that God's anger is not like our anger.
Our anger is usually a fit of passion, it is often uncontrolled, and leads to rash and foolish actions, and words. This is why the word "mad" means both angry and also crazy.
God has wrath and he can be very angry, but he is never out of control, he is never driven by passion to rash or foolish action or words.
As to the reason why God seems angry in the Old Testament and not in the New Testament, there is a prophecy in Isaiah which begins by fortelling the day of God's favor when his favor and mercy are showered on the earth. The prophecy ends with that favor and mercy ending and God's wrath and judgement coming instead. This prophecy was linked to the coming of messiah.
When Jesus began his ministry, he did so in a synagogue by reading that prophecy of Isaiah. He read the portion that proclaimed the day of God's favor, but he stopped prior to reading the protion about the coming wrath.
After he stopped reading he said to everyone there 'today this is fullfilled in your hearing".
Jesus' ministry began the day of God's favor upon the world. Because of Christ, God's grace and mercy is being showered upon the whole world. Eventually that will come to an end and the day of God's wrath will come and all those who are not in Christ, will experience the wrath they have stored up for themselves.