Question
Answer
May Allah guide you to the right path and accept your repentance!
Yes, if you repent and come back to religion with sincerity, you will be on the path of Islam and tawheed.
You may recite 'Shahada' again with correct intention in your heart and words on your tongue.
According to a Mufti (scholar), after reciting the correct 'Shahada', you should ask to perform the Islamic Nikah again, with witnesses.
Here is an article on repentance you may find useful:
Seeking Forgiveness (Tau'bah)
http://islameasy.org/Taubah_Benefits.php
And Allah knows best.
Ask Alimah Team
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