If determinism is true then the determinist’s belief in determinism was not the result of a careful study and consideration of the facts and logic of determinism. It was merely the causal agent (whether biology and neurons firing, or God) causing that person to hold that belief. Just as it is the causal agent making other people reject determinism.
A screenshot from a book by Greg Koukl (five point Calvinist, but affirms free will):
Here is the late Ravi Zecharias explaining the same over 6 minutes: https://www.youtube.com/watch?v=ysilAAo5RcA
Crime detective J Warner Wallace explaining the same over 3 minutes: https://www.youtube.com/watch?v=OlI5FDg5Xlw
Philosopher Tim Stratton explaining it at length over 2 hours: https://www.youtube.com/watch?v=qFKg0veH7fo&t=5469s
Braxton Hunter, president of Trinity College of the Bible, from From 12:13 of https://www.youtube.com/watch?v=Y9Uktg9nLx8&t=11s
Frank Turek of Cross Examined: https://www.youtube.com/watch?v=YBQjs41uabg&t=2s
A quote by an atheist:

September 8, 20 at 6:37 am
wonderful listing of resources on this subject!
Thank you Scott
September 25, 20 at 11:54 pm
A rare thing – to find a Calvinist who thinks logically!!
Scott – how do you incorporate pictures?