There’s a noticeable difference in the Bible’s portrayal of God. In some passages God is seen full of anger while others show him full of tenderness. 
As early as 144AD some, like Marcion of Sinope, taught the God of the Old Testament was not the same as one of the New. The Church dealt with that issue long ago but still this pops up from time to time.
Jesus, the Church, and even the Bible itself has always maintained there is only one and the same God — the difference is with with people.
For example: Vandals thinks I’m the grouchy old man who calls the police on them but non-criminals see a different side — I’m the same guy.
Another example: My young children think I’m the smart man who helps them solve their problems, hugs them all the time, and gives them stuff. My teens think I’m the stubborn guy who makes their life difficult and requires them to bring the car home by midnight. Some of my children think I’m the stupid guy who is just out of touch while others think I’m getting smarter as they get older.
I’m the same guy, the difference is the relationship my children have chosen to have with me.
The Bible says God is “Love” (1st John 4:8, 16) and a “consuming fire” (Hebrews 12:219) all at the same time. He offers a tender relationship if we will choose it.
“Jesus said If a man love me, he will keep my words: and my Father will love him, and we will come unto him, and make our abode with him.” — John 14:23
— fritz
Patrikin - Kinship through The Father 