Really? If I, as a father, have to stand by and watch one of my daughters or my son get slaughtered, you think I do not suffer?
Yes, true. However, there is more to the story. The Bible is not a book of metaphysics, tells us very little about how God is built. it provides snap shots that often conflict. It's up to the reader to pout them together into a meaningful whole. So, the early fathers looked heavily to Hellenic metaphysics. They were deeply influenced my major schools which stressed that the world of time, change, and matter is a big illusion, evil. The truly divine, the "really real," is a transcendental world of the wholly simple, immaterial, and immutable. The Greeks enshrined the immune and the immutable. This, in turn, led to what is called classical theism, the classical Christian definition of God as void of body, parts, passions, compassion, wholly immutable. God could not have emotions, as emotions denote changes in bodily states, and God has no body and God does not change (Aquinas). St. Anselm argued that since God is passionless, God also is without any compassion. Also, God is the most superior of all beings. Not to suffer is better than to suffer. So God cannot suffer. Again, Aquinas argue that God is an actus purus, a statically complete perfection. Therefore, God can experience no negative emotion, as that would mean God could improve and change. I could cite plenty of other examples the m from the major fathers and creeds and confessions. For example, it is axiomatic in Christology that Christ considered of two separate natures, one human, the other divine, the God part. Only the human suffered, definitely not the divine, a s the truly divine is defined as impassible, meaning incapable of emotion, most especially suffering. Check our the Second Helvetic Confession here. So, yes, in traditional Christianity, it was a heresy to suggest God suffered. In recent years, since the end of WW@, many theologians have seriously challenged the classical view, arguing it presents but a wholly unloving and insensitive God. Hence, there is now a major movement called neo-classical theism, which is where I, as a theologian, stand.