...supposedly saying he is? Let me see if I can guess what you're going to say...
"God's the good one because he's holy."
OK, so what evidence do you have that he's holy, besides him saying so?
"God's the good one because he's more powerful."
OK, so then you admit your morality is just might makes right.
"God's the good one because the Bible says so."
OK, what evidence do you have that God was the one who inspired the Bible?
"God's the good one because he did X."
OK, what evidence do you have that God was the one who did X?
"God's the good one because he's holy."
OK, so what evidence do you have that he's holy, besides him saying so?
"God's the good one because he's more powerful."
OK, so then you admit your morality is just might makes right.
"God's the good one because the Bible says so."
OK, what evidence do you have that God was the one who inspired the Bible?
"God's the good one because he did X."
OK, what evidence do you have that God was the one who did X?