As I have said before, I do not believe God causes suffering, but I do believe He can help us to deal with it and ultimately bring good out of it.
Perhaps you should read Amos 3: 1-5 where you will see that the Bible itself explains how God does indeed cause suffering.
On your second point, my faith would prevent me from using any reasoning which did not include God, because I know Him, I trust Him and I love Him.
Which, of course, translates, "I have disabled my own conscience and allowed an external agency the privilege of assuming that role for me. I accept as moral whatever I am told God thinks is moral."
Have you thought about how ripe you might be to being exploited? Can you see why you might be a danger to your neighbours with an attitude like that?
I know. You can't. God is good. End of analysis, right?