Examples from Scripture that refute the notion that God is not sovereign - people can act against His will and plan:

• The bible gives us many examples of people who had (or will have) no choice but to act as God wanted them or will want them to, among them Pharaoh in Exo 3-13, and Gog in Eze 38 and 39. In the same way, Judas was given up by God to Satan and thereby to a terrible fate (Joh 13:27, Mar 14:21), that is, to deliver Jesus to the authorities, so that God's pure sacrifice might be made to redeem those that fear God from the wages of sin.
• God claims over and over again to be "God Almighty" - in the KJV we find this in 57 verses, both Old Testament and New Testament. To deny that God is sovereign means to claim that God lies.

When it comes to the Scriptures, Mark Twain's remark applies in an interesting way:

"It is not what you do not know that will hurt you the most. It is what you think you know, but it just ain’t so!"