Thank you very much for all your fast and good advice.
Most of you say it is best to be quiet about that. Well, it gives me a lot to think about.
I am actually not a person who likes to pretend something different for what I think. That's why for example I wrote to the elders a letter about some of my doubts (I must say these elders are very loving). A few times they wanted to meet with me to reason about them. It was interesting as I asked why there are so many changes in doctrine, if the Governing Body is spirit directed (especially with a view to the Faithful and Discreet Slave change of understanding). Our presiding overseer told me, that this is something that we all have to chew on and that in our society nothing is fix. I also asked him how he would react, if his bible study said, that if he becomes a witness, all of his family would completely shun him. I showed him the Awake article that says "nobody should be forced to choose between his religion and his family." Moreover I told him, that this shunning is leading to huge depressions and sometimes suicide. Well, the only thing that he could tell me was, "the rules are clear; discipline is always painful."
With my wife I can no longer discuss things like that (I also don't want to destroy her faith as everyone has freedom of religion and conscience).
Nevertheless I think that she has to know one time, about my true feelings about blood transfusions. This is a life and death matter, especially if our child is involved.
But probably I will wait about telling her and to do my best to be a good husband. Probably I will ask her how she would react, if our child is in a life threatening situation.
In the last elders school, they told us to cooperate with doctors when a minor is involved and not insist on no blood transfusion (just tell them of our blood less wishes). If we would insist on no blood, this could lead to taking away the right to care for the child.
Thank you again very much. It is very good to see, that a lot of others were going to similar situations.