According the Bible trials happen for a reason. Sometimes its for us to grow. For me its usually to teach me to lean on Him. Sometimes its for someone else. I may endure a trial simply so I can help someone else later with compassion and understanding.
No where in the Bible does it tell us life will be all peachy just because we are saved. In fact, it tells us the opposite. We will have trials, as I just mentioned. We will also be attacked for what we believe. (Do you think the Muslim world hates us because we are a rich capitalist society or because they view us as Christian society?)