Q. If one has become muslim through marriage, but did not always stay on the path and has finally decided to follow the Deen, should she/he re-do the Shahadah?
A. If, based on one’s actions, one has done such things or uttered such statements that show that one was no longer a Muslim, then it is essential to repeat the Shahadah and even the marriage. However, if it did not reach to this extent, and it was simply a matter of laziness to practice Islam and one did not give up Islam, then it is not a requirement to re-do the Shahadah. Howbeit, it should be a common practice for all Muslims to regularly recite the Kalimah of Shahadah. This strengthens your faith and refreshens your Imaan.
And Allah knows best.
Mufti Waseem Khan
This answer was collected from DarulUloomTT.net, which is operated under the supervision of Mufti Waseem Khan from Darul Uloom Trinidad and Tobago.