I don't believe "God" is a sadist, but that's probably because I don't believe in the tetragrammaton. If you took the Bible as your basis for proving God's existence and if you believed 100% that everything in the Bible was true, well...There're things in the Bible that contradict itself.
Deuteronomy 20:16- The fathers shall not be put to death for the children, neither shall the children be put to death for the fathers: every man shall be put to death for his own sin.
Isaiah 14:21- Prepare a place to slaughter his sons for the sins of their forefathers; they are not to rise to inherit the land and cover the earth with their cities.
I think Deism, more than anything fits the puzzle together better than anything else for now.