So many people have heard parts of Romans 9 only or heard a reformed theology teaching on it that ignored the context. This simply means they heard a message that Gods controls everything and everyone and you can’t ask questions about it.
The highlight verse for this is :
But who are you, O man, to answer back to God? Will what is molded say to its molder, “Why have you made me like this?”
So why I think this is funny, if this scripture means God controls everyone, then it means He determined that the person who is asking “why” would ask why, so it is like God has a puppet in His hand and it playes out like this :
God : I have made you my puppet.
Puppet : Why have you made me a puppet?
God : how dare you ask me that!
See how funny this is. 
That is why you need to read the context and not just lend your sensemaking to your favourite reformed preacher.
