Someone who says that they don't believe in a God who allows tragedy to happen like earthquakes and tsunamis shouldn't then even start to believe in the Christian God.
That's because if you believe that God shouldn't allow such things to happen, then the book of Revelation quite contradicts that kind of belief where we have prophecies of God allowing unimaginable amounts of destruction on the earth including allusions to meteorite impacts, devastation of 1/3 of the earth's land mass, contamination of 1/3 of the water supply, diseases that ravage 1/3 of human population, etc.
We'd like to believe in a Santa Claus god. A god who gives presents, or treats us to ice-cream or molly coddles us.
I think the book of Revelation puts that to bed. Yes, God is one who loves us so much that he gave his only son to die for us, but there are so many aspects of God that no one image can adequately describe him. To subscribe to one image is idolatry.
It's interesting that when it comes to thinking about God now, how can I pray or communicate to him without creating an image in my mind?