Repentance from Spreading Anti-Islamic Materials

This of course is a great blessing of Allah and a favor. We pray to Allah
that He grant you perseverance.

As for those who were engaged with their tongue and their pen in a war
against Islam by spreading distorted ideologies and doctrines, or by
spreading misguided innovations and corruption, the following is incumbent
upon them:

Announce their repentance and renounce all that they used to spread in
antagonism to Islam, in order that the renunciation becomes well known, and
so that no one can claim to be misguided by their disowned writings. This
renunciation is an obligation and is a precondition for the acceptance of
repentance.

Allah says (what means):

“Save for those who repent, make amends and show clearly [what they used to
say/rule wrongly], it is from those whom I accept their repentance, and I am
very Forgiving, very Compassionate.”

[2:160]

The tafseer (explanation) for this verse indicates that it was revealed
regarding the scholars of ahl ul-kitab (People of the Book) who used to
conceal what had been revealed regarding the signs of the Prophet (peace and
blessings of Allah be upon him) and the commands to believe in him.

The repentant person should now engage themselves in the spread of the truth
of Islam, spending their energies in defense of its teachings, and educating
people in their religion. They should use their power of speech or writing
to counterattack the forces of falsehood, to expose their deceits, plans and
strategies, even as he used to co-operate with them in opposing Islam, and
thus become a sword in the defense of Islam. It is also binding on he who
convinced another man, even if in a private meeting, against things declared
haram (forbidden) by Islam, such as, for instance, taking interest, to get
in touch with the person he was instrumental in changing his opinion and let
him know of his own renewed enlightenment.

And Allah knows best.