I am beginning to think that we need to take things very slowly.
Your statement in red is not what the statement in bold is saying. God is not being equated with fathers. Rather it is saying one day people ‘used to’ not anymore but used to during days of jahiliya celebrates fathers as though they were gods. Because they ‘used’ to do it, it means they no longer do it, so the verse is saying what you used to do was wrong, but if you do the same thing i.e. the celebration but this time doing it for Allah then it becomes right.