What is the ruling on my marriage, and is it sufficient to renew the marriage contract if the first one was void? And what should I do, knowing that I used to interrupt my prayers before marriage, and I participated in jokes that denigrated Allah and His Messenger, and I used to repeat the phrase "May your sanctity be cursed" by way of jest and laughter?

It is not permissible to circulate jokes that demean Allah and His Messenger, for this is an act of disbelief (kufr), and a claim of ignorance in this regard is unacceptable. Cursing is a serious matter, and it is not permissible to curse someone who does not deserve it, for the curse may return to the one who uttered it. There is a difference of opinion regarding abandoning prayer out of laziness, and the Hanbali school of thought holds that it takes one out of the fold of Islam. As long as you have become upright and renewed your marriage contract as a precaution, resume your life and do not pay attention to whispers (waswas).