HI Sree, it seems that the question " explain the presence of God," may be better restated, given the subject matter " why do bad things happen to good people," or " why do bad things happen, period."
Free will, the very essence of what makes us human, the ultimate blessing of being, is also the source of evil. The very fact that we can choose makes us who we are, if we could not choose then we would be to varying degrees, robots, programmed to behave in a certain manner. God is the source of life itself, but He is not the source of evil. It's the heads and tails of a coin, there could be no coin unless it had both sides, the ability to choose good or evil. And then of course we know the story of Adam and Eve and how this freedom of choice allowed them to violate the direct command of God and thus create the genesis of evil in humanity.
Now, that explains who we are and why there is evil in the world and that it does not come from God, but all of that is of little comfort to the pain of someone who has suffered tremendous loss, either of a loved one or has suffered at the hands of evil.
Yet, the very essence of who we are in Christ is that in the midst of great suffering we can discover that God has not left us nor forsaken us, but rather has created a table before us in the presence of our enemies. I have spent several hours in last couple of weeks with a man whose 30 year old son hung himself and the man found him. This happened at the beginning of this year.
12 weeks ago he was diagnosed with cancer. This man is nearly 60. Now, what a joy to fellowship and encourage a brother who , despite the enormous pain of his loss, and the many deep emotional and spiritual valley's he has traveled through this year, can still praise God. We have spoken much about Job and his great declaration of faith " even if He slay me, yet will I trust Him." These are no mere words, this is the blood that pours from a wounded saint.
What is in us will come out in times of trial. The man, I have discovered, has dealt with many trials in his life and has witnessed God taking him through them all. He is strong in his faith because over the years God has built up his strength so that when a mighty trial comes, when the great storm comes and takes others away, the man of God, who stands upon the solid foundation of Jesus, he is not swept away. Joyful submission to every trial, cheerful endurance of suffering is the key to the arming of the saint who , come the evil day, will be able to stand........bro Frank