The fact that a religious person might have been an atheist has nothing to do with the validity of their claims. The Bible is full of internal contradictions and hasn't been demonstrated to be true, so things in there matter only to people that have chosen to believe in it on faith.
Quantum Physics support these observations.
That is a statement about quantum physics that is false. Quantum physics does not require the existence of a spiritual world to work, so claiming it supports it is fallacious. There is no real reason to come to this conclusion. If you want to talk physics, you have to be ready to talk evidence, right? What evidence do you see in quantum mechanics that would support the existence of a spiritual world?
The idea of the holographic universe is just an idea for now. And even if it turns out to be the case, there is no logical connection between a holographic universe and a spiritual world as a spiritual world would not be a necessary condition for a holographic universe to be possible.
Atheists Scientist turn to God
For me, it is not about religion. I am not religious. Thank God! Religions are false contracts with other humans in my view. Scientists who turn from Atheism to Having a Relationship with God have turned to God because of scientific evidence. Most tried to prove that God didn't exist and not only were unable to do so but their scientific skills led them to the scientific conclusion that God does exist. How are their skills and findings now that they believe in God less relevant to when they did not believe?
Bible or Not Bible
I have and am studying the Bible without finding evidence of any contradictions. It is a master piece written by 40 authors in 66 books forming ONE congruent message. Have you or are you studying the Bible? Or is your statement/belief the result of someone else's opinion? Many translations of the Bible are misleading and false. One can only arrive at the messages in the Bible by also studying the original languages. Genesis 5 is a good example. It reads like a phone book. But hidden in it foretold is the coming of Christ, encoded in the names from Adam to Noah.
QP
As for QP, the fact that a particle can be observed in two different places at the same time, and the fact that they are communicating with one another instantly - is the very definition, and in my view, proof of the existence of spiritual reality.
I do wish you all the best.
Take care.