Why do 34% of Americans reject all forms of organized Religion?

People are more educated today than in the 1950s. Most people I met in the 1950s hadn't even finished high school. During the Viet Nam War this changed because young men didn't want to die in Viet Nam and didn't understand why we were there in the first place.

I would say the mistrust of all national and public institutions of all kinds really began in the 1960s when more people became more informed and therefore became less idealistic and naive in the way they made choices. 50,000 dead American boys (for what reason?) ended public trust of Government, institutions and organized religions. Then on top of this molestation of children (both boys and girls) increased this mistrust of religions as more and more of this religion caused molestation came to public light.

People began to realize celibacy often caused the rape of children, especially when men became involved in trying to be celibate. Then people realized children had ALWAYS been molested through churches worldwide for thousands of years and became horrified with religions as a result of this.

This is only 1 of hundreds of factors that have led to the rejection of all organized religions by people who have at least finished high school or who have gone to college at all here in the U.S.

Then, people started studying about Science and philosophy more and died less from unexpected things. IF people don't have to worry as much about things that go bump in the night that they cannot define because medicine has caught up and their standard or living is better then many times they don't need to believe in God as much because they aren't in danger of dying any day quite so much.

So, all these things and more have led to the rejection of organized religions by 34% of the American Adult public. And because of education and medicine I believe by 2050 this will likely go up to about 50% of the public unless there is  pandemic or world war to markedly change things from the ways they are now.

Is this good or bad?

It depends upon your point of view whether you think this is good or bad. I would say it is both good and bad at the same time. So, basically it greatly changes the way people make decisions. In some ways they are freer and yet likely there will be more suicides now than before either directly or through drug overdoses because less people believe in God than before. So, whether you see this as good or bad is subjective rather than objective in the end depending upon your belief systems.