Actually He is, if we don't repent.
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Here are the word spoken by Christ.
D&C 19:
15 Therefore I command you to repent—repent, lest I smite you by the rod of my mouth, and by my wrath, and by my anger, and your sufferings be sore—how sore you know not, how exquisite you know not, yea, how hard to bear you know not.
16 For behold, I, God, have suffered these things for all, that they might not suffer if they would repent;
17 But if they would not repent they must suffer even as I;
18 Which suffering caused myself, even God, the greatest of all, to tremble because of pain, and to bleed at every pore, and to suffer both body and spirit—and would that I might not drink the bitter cup, and shrink—
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If we do not repent, then His vengeance, wrath and sufferings will come upon us-Christ tells us this very plainly. If we do repent, then no it will not come upon us. So He is both someone who is ready to punish and someone who is ready to heal-it entirely depends on if we repent of our sins.
