Is the suspension of disbelief regarding something due to obsessive-compulsive disorder, and the thought of breaking it and renewing one's Islam, considered a suspension that necessitates breaking it, and is the action upon which I suspended it forbidden to me?

What you are thinking about does not entail a ruling, because it stems from waswas (whispering of Satan/obsessive thoughts). You must completely disregard it, pay no attention to it, and occupy your time with dhikr (remembrance of Allah), reading, and seeking knowledge. Make use of your effort and energy in what benefits you in your religious and worldly affairs, and maintain your adhkar (plural of dhikr). It may also be beneficial for you to consult a psychiatrist.