While there have been cases of scientists who were atheists and later converted to belief in God, it is important to note that such cases are relatively rare and individual beliefs vary greatly among scientists. Here are a few examples of scientists who have expressed religious or spiritual beliefs, although not all of them were necessarily atheists before their conversion:
Francis Collins: Francis Collins is a renowned geneticist who led the Human Genome Project. While he was not an atheist, he described himself as an agnostic for much of his early career. However, later in life, Collins converted to Christianity and became an advocate for the harmony between science and faith. He wrote a book called "The Language of God" in which he discusses his journey from atheism/agnosticism to belief in God.
Allan Sandage: Allan Sandage was an astrophysicist and one of the most influential astronomers of the 20th century. Initially an agnostic, he later became a Christian and described himself as a "converted Christian." Sandage believed that his scientific research and discoveries pointed to the existence of God.
Alister McGrath: Alister McGrath is a well-known scientist and theologian. He initially studied as a chemist and later earned a Ph.D. in molecular biophysics. While not a high-profile researcher in the scientific community, McGrath has written extensively on the relationship between science and religion and is a prominent Christian apologist.
It's important to remember that individual beliefs are highly personal, and not all scientists who have religious or spiritual beliefs necessarily underwent a conversion process or were previously atheists. The relationship between science and religion is complex, and scientists hold a wide range of views on matters of faith and belief.