ICR treats God's existence as likely and ends up with a view that the "all things in the universe were created and made by God in the six literal days of the creation week" No, ICR treasts God's existence as fact and starts with the view that all things were created and made by God in the literal six days of the creation week.
You're right. ICR treats God's existence as a fact. On the other hand, why not? it is. :-)