Anyone who claims to be happy about everything that God asks them to do or believe is lying, delusional, or uninformed.
Do you feel better now? I do.
I think we do a disservice to Christian and non-Christian alike when we pretend to be like we always understand, or are happy about, all that God asks us to do and believe. If that were really the case, we'd all be perfect. But we're not. Why pretend?
In Jonah chapter 3, Jonah finally complies with God's instruction to go to Nineveh, but he wasn't happy about it. Some commentaries on the passage want to focus on Jonah's obedience, but I think it's misguided. Jonah was obedient, but just barely. He's not falling over himself because of the grace of God, eager to demonstrate gratitude. Jonah's still the same grumpy old prophet that we see in chapters 1, 2, and 4. The main difference is that he's come to the conclusion that God's path is better than his path; that pursuing God, even when it's difficult, is better than "forsaking our hope of steadfast love".
So he goes. But he doesn't like it.
The Christian life begins in that moment when we recognize God's grace towards us and realize that following his plans for our life are better than following our own. That God's paths lead towards life; our paths lead towards destruction. That's what Jonah realized.
The challenge comes when we realize that some of those things that come along with believing in God or following him are going to challenge our preconceived notions about how life should be. For example, in my heart, I want to pursue as much money as possible to use for my own purposes and pleasure; God tells me that if I really want to experience life, any financial gain I pursue is for the good of others, and particularly, for the advancement of the Kingdom of God. So I try to give of my resources generally, but I don't always like it (particularly when the car is breaking down, or I want a new cell phone.)
That's why when God fully revealed himself in the New Testament, he didn't just write another letter or give another list of commands. He came as a person. If all I had was the commands of Christ, it would be difficult to wrap my head around the things he asks me to do. But because I know the person of Christ, I know that I can trust him, even when some of the things he asks seems difficult.
The question we need to ask ourselves is not, am I happy about all that God asks me to do, the question is, can I trust Jesus? Can I follow Jesus? Is he trustworthy? And if he is, then I can follow him, even if I don't always like it.
It's worth noting what happens to Ninevah, even after Jonah half-heartedly obey's. "The people believed God." They didn't believe Jonah. They weren't impressed with Jonah. They believed God.
Admitting that we don't always like or understand what God is doing doesn't make people less likely to trust God, it actually makes them more likely to trust him. Instead of pointing to our own ability to follow, we point to Jesus' worth as a trustworthy source of life. That way, even when we're only half-heartedly obeying, we can say, don't look to us, look to Him.
And people may just believe God.