One very sunny Madrid day at Easter 1973, I read Romans 2:14 in my year-long quest to prove that: A] I had no need of Christianity and B] It was bogus in any case.
Within a matter of seconds after reading the above text all my arguments collapsed - I shan't explain the wherefores at this point - and I yielded to God and knew instantly and for all time that I had hit TRUTH. This 'saving faith' was the first miracle. It was real and immediate and so I am utterly unable to grasp how anybody can possibly 'go from belief to disbelief'. I have to assume that there was nothing substantial there from the start. God is not an opinion!
The second miracle in that same moment was that all the Scriptures of all the years gone by suddenly slotted instantly into place and made complete sense. A mishmash of bits and pieces became a cohesive whole in an instant.