I can add very little to the excellent responses above except to pass on the words of a song I have heard Joni Erickson Tada sing (and have the distinct honor of having her personally autograph the song book with that and other songs.)  The song is Journey's End, some of the words go:

Father, set my soul sailing like a cloud upon the wind,
Free and strong to carry on until the journey's end.
Each mile I put between the past and the future in your hand
I learn more of your providence and find out who I am.
I want to thank you for the gift of your Son,
and for the mystery of prayer;
and for the faith to doubt and yet believe that you're really there. 

I was struck to hear someone with such strong faith admit to doubt, and also struck to realize that I too yet believe even though there is very little I can begin to understand.

I've always been interested in radio transceivers but it escapes me how I can key the mic in a driving rain and that signal goes undistorted many miles away to another transceiver and someone actually responds.  I don't understand it but I have the faith to key that mic and depend upon those radios.

I can look out my window and see the trees beginning to bud and cannot believe that a scientist could create a living tree from a flask of chemicals or a store room of chemicals, and neither could he probably be creative enough to imagine a tree if he had not seen one first.

And then look at children; if that does not make you believe in miracles, you fail to grasp the beauty of life.  Gaze about this universe and try to deny the creative hand that put it all in place; and as you witness some horror, recognize the sin that brought it about.

Living on faith in the things we do not understand is not difficult.  Living life always needing "the answer" can be difficult.

May God walk with you and may you allow Him to carry you when you don't understand!