Let's take a look...
which confession do you use?
Let's try the baptist, 1689:
Chapter 3:1
1. From all eternity God decreed everything that occurs, without reference to anything outside himself.1 He did this by the perfectly wise and holy counsel of his own will, freely and unchangeably.
Yet God did this in such a way that he is neither the author of sin nor has fellowship with any in their sin.2 This decree does not violate the will of the creature or take away the free working or contingency of second causes. On the contrary, these are established by God’s decree.3 In this decree God’s wisdom is displayed in directing all things, and his power and faithfulness are demonstrated in accomplishing his decree.4
1. God decreed (caused) everything that occurs.
2. Yet God is not the author of sin.
3. God's will does not violate second causes..but they are, instead established.
4. God directs all things and His power is established in accomplishing His decree.
I do find the above to state conflicting ideas.
If God decreed everything that happens, that will necessarily include evil.
God establishes even second causes.
There are Calvinist teachers that clearly state that God created even evil.
Douglas and Piper would be two of them.
Piper said that even the dust in the air is directed by God.
Anyway, this is off topic and I do believe that the reformed faith teaches core Christian tenets.