As finite creatures, it is absurd to believe we could know God perfectly. Even if He was to give us a perfect explanation, we would struggle as much to read it as a complex equation in a foreign, extinct language. Because of this, there are multiple examples in Scripture of God condescending to us. That is, in order to explain Himself, He uses language we can understand, like when we tell children "there's a baby in mommy's tummy". A child cannot be expected to understand that their new sibling is specifically developing inside their mother's womb, so we condescend to them.
The irony is, this often leads to misunderstandings, creating, in some cases, polar opposite theological groups. For example, can God change His mind? Numbers 23:19 seems to suggest that no, He does not. Yet, Jeremiah 18:8 famously promises that if God speaks against a nation, and that nation repents, He will relent of the disaster He intended to bring upon it. So, does the God who doesn't change His mind... change His mind?
The answer to this is simple: Foreknowledge. When you add God's foreknowledge into the equation, you see that God never actually changes His mind about anything. Rather, He has a goal in mind, and He sets out to achieve it, in some ways using His own nature. By nature, God must punish sin, and so when He says "repent, or I will destroy you", He is telling the truth: repent, or I will destroy you. But He already knows ahead of time which side of the "or" His target will fall on. If they repent, He knew it. If not, He knew that.
Just as with the issue of God changing His mind, there are complexities to His sovereignty that Calvinism, as a philosophy, fails to account for. Can anything happen that God does not will? A person going to Hell, for example? Calvinists typically argue no. In fact, this is a necessary part of their doctrines of grace. Total Depravity denies that man is capable of coming to God of his own free will, Irresistible Grace asserts that if God wants to bring you to Him, you will come. The necessary conclusion, therefore, is that if even one person is able to reject the call of salvation, God is not sovereign, because something can happen outside of His will.
But this does not fit well with verses like Lamentations 3:33, which, in the majority of English translations, says God does not willingly afflict the children of men. Our afflictions are not pleasing to God even on the Earth. In this finite, fallen plain of existence, things happen to us that are not pleasing to God, even things God quite intentionally afflicts us with. Why? Did something overpower Him? Did He succumb to hypnosis? Did the devil blackmail Him? The obvious answer to all of these is no. God's sovereignty necessitates that nothing in all of creation is greater than He is.
So what's the solution? Condescension. We are simply not able to fully understand the sovereignty of God. But what we are able to understand, He does explain. A good place for us to start is in 2 Timothy 2:13, where we are told that God "cannot deny Himself". Here, we see the origin of every limit God has. What's this? God has limits? Yes, there are things God cannot do, simply because they are not Godly things to do. It is not within God's nature to lie, so God cannot lie. It is not within God's nature to deny Himself, so God cannot deny Himself. This isn't a denial of His sovereignty, it's a picture of it. The one and only limit on God is God Himself.
What this means is that God cannot create free willed entities without giving them the ability to resist His will, as Luke 7:30 tells us very plainly that the Pharisees and lawyers did. God willed for them to be baptised, they did not get baptised. Are they therefore more powerful than God? If we take the Calvinistic interpretation, yes, they must be. To reject God's will is to contradict His sovereignty, making a creature more powerful than the Creator. Yet, this is in Scripture. We cannot deny Luke 7:30.
Since Luke 7:30 clearly tells us that these people did reject God's will, up to and including baptism, we must conclude that even if things happen outside of God's will, God's sovereignty remains intact. Calvinism, therefore, is the theological equivalent of children hearing there's a baby in mommy's tummy, and concluding that, therefore, she ate the baby!
Unlike the idols of old, God isn't really in the habit of eating babies. Nor is He in the habit of tempting humans to sin, forcing them to accept His gift of salvation, or dangling that gift in front of them without having any intention that they unwrap it. These are all necessary conclusions of Calvinism, but they are as carnal as the belief that since God appears to change His mind, therefore He does not have foreknowledge, as the Open Theists claim.
The condescension of God, due to His unfathomable nature, means there will always be things we can't understand about Him. Sadly, this does lead to misunderstandings about Him, especially when we focus on one set of Scriptures and not the others. If we focus on God's sovereignty without due care and attention to details about man's responsibility, it is absolutely inevitable that we will go from misunderstanding God to misrepresenting Him. Therefore, Calvinism must be rejected, simply because it is an incomplete understanding of God based on taking His word too literally in certain areas.