Does the obligatory extension (dammah) of the letter meem in the word "Muhammadan" to a waw, or the non-pronunciation of the letter ha in the word "Allah" as "Alla," necessitate re-pronouncing the Two Testimonies, whether in prayer or when entering Islam after the sin of insulting the religion?

Errors in prolonging a vowel sound or adding to it do not invalidate the recitation of the Two Testimonies (Shahadatayn) or the prayer, and one is excused for such errors if unable to avoid them. However, omitting the letter 'hā' from the name of Allah when reciting the Two Testimonies necessitates re-reciting them correctly. It is incumbent upon a Muslim to pay attention to the proper pronunciation of the name of Allah. We caution the questioner against obsessive doubts (waswasa) and advise them to disregard them, avoiding unnecessary rigor and extremism.