I am from a Muslim family, but for several years of my life I did not practice any of the rituals of Islam at all. In fact I even tried to learn another religion, and I practised it on a daily basis. That went on for approximately seven years, but during that time I still used to fast during Ramadan, but there were some days each year when I did not fast. Now – praise be to Allah – I have found my way to Islam, and I’m trying to remember the number of days that I did not fast, but I cannot remember that, let alone the days of my period during those months. I am not sure whether I will be able to make up those days in the first year.

My question is:

Am I obliged to make up the days when I did not fast from the first year, when I am not sure that I will be able to make them up? How can I make up the days that I did not fast during the other six years?

Praise be to Allah

Firstly: 

We
praise Allah for having blessed you with guidance to Islam and adherence to
its teachings, and we ask Allah to make us and you steadfast in Islam and on
the straight path until we die. 

You have to keep on asking for forgiveness for what you did of apostatising
from Islam, and for what you fell into of shortcomings and negligence. We
give you the glad tidings that Allah, may He be exalted, accepts repentance
from His slaves and forgives their bad deeds, for Allah is Oft-Forgiving,
Most Merciful. 

Allah, may He be exalted, says (interpretation of the meaning):


“And He it is
Who accepts repentance from His slaves, and forgives sins, and He knows what
you do”


[ash-Shoora 42:25]


“Say: O ‘Ibaadi (My slaves) who have transgressed against
themselves (by committing evil deeds and sins)! Despair not of the Mercy of
Allah, verily, Allah forgives all sins. Truly, He is Oft‑Forgiving, Most
Merciful.


‘And turn in repentance and in obedience with true Faith
(Islamic Monotheism) to your Lord and submit to Him, (in Islam), before the
torment comes upon you, then you will not be helped.


‘And follow the best of that which is sent down to you from
your Lord (i.e. this Quran, do what it orders you to do and keep away from
what it forbids), before the torment comes on you suddenly while you
perceive not!’”


[al-Zumar 39:53]

Secondly: 

What you did of learning another religion, other than Islam, then practising
it is clearly apostasy from the religion of Allah, may He be glorified and
exalted, according to scholarly consensus, even if you continued to adhere
to something of Islam. In fact even if you continued to practice all the
obligatory duties of Islam, it is still apostasy, because failing to be
resolved in adherence to Islam, or wavering between it and another religion,
or following another religion, whilst still adhering to its rulings – all of
that clearly constitutes apostasy from the religion of Allah, may He be
glorified and exalted, and there is no doubt about that. No deeds based on
Islamic teaching can be accepted from a person, no matter what he does,
unless he repents from his apostasy and gives up everything apart from the
religion of Islam. 

Allah, may He be exalted, says (interpretation of the meaning):


“And whoever
seeks a religion other than Islam, it will never be accepted of him, and in
the Hereafter he will be one of the losers”


[Aal ‘Imraan 3:85]


“Truly, the
religion with Allah is Islam”


[Aal ‘Imraan 3:19]

Shaykh Ibn ‘Uthaymeen (may Allah have mercy on him) said: Whoever believes
that it is permissible for a person to observe whatever religious practices
he likes, and that he is free to observe whatever religious practices he
likes, is a disbeliever in Allah, may He be glorifies and exalted, because
Allah, may He be exalted, says (interpretation of the meaning):
And
whoever seeks a religion other than Islam, it will never be accepted of him”
[Aal ‘Imraan 3:85]
and
Truly,
the religion with Allah is Islam”
[Aal ‘Imraan 3:19]

It
is not permissible for anyone to believe that any religion other than Islam
is permissible, and that it is permissible for a person to worship Allah
according to that religion; rather if he believes that, then the scholars
have clearly stated that he is a disbeliever whose disbelief puts him beyond
the pale of Islam.

End quote from Majmoo‘ al- Fataawa (3/100) 

And he said: We believe that the teachings of the Prophet (blessings and
peace of Allah be upon him) are the religion of Islam which Allah, may He be
exalted, has chosen for His slaves, and that Allah, may He be exalted, does
not accept any other religion from anyone. 

We
think that anyone who claims nowadays that any religion is acceptable to
Allah, other than the religion of Islam, such as Judaism, Christianity or
anything else, is a disbeliever. He should be asked to repent, and if he
repents, all well and good; otherwise he is to be executed as an apostate,
because he has disbelieved in the Qur’an. 

End quote from ‘Aqeedat Ahl as-Sunnah wa’l-Jamaa‘ah (p. 21) 

Thirdly: 

Once this is established, if the apostate repents and returns to Islam, then
he does not have to do make up the prayers and fasts that he did not do
during the time of his apostasy, because Islam erases what came before it
and repentance destroys what came before it. 

Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) was asked: Does
the apostate have to make up prayers and fasts if he comes back to Islam and
repents to Allah? 

He
replied:

He
does not have to do make them up. Whoever repents, Allah will accept his
repentance. If a person did not pray, or he did any of the things that
nullify Islam, then Allah guides him and he repents, then he does not have
to make up (those acts of worship). This is the correct scholarly view,
because Islam erases what came before it and repentance destroys what came
before it. Allah, may He be glorified and exalted, says (interpretation of
the meaning): Say
to those who have disbelieved, if they cease (from disbelief) their past
will be forgiven. But if they return (thereto), then the examples of those
(punished) before them have already preceded (as a warning)”
[al-Anfaal 8:38]
. So
Allah, may He be glorified and exalted, has told us that if the disbeliever
becomes Muslim, Allah will forgive him his previous sins. 

And the Prophet (blessings and peace of Allah be upon him) said: “Repentance
erases what came before it and Islam destroys what came before it.” 

End quote from Majmoo‘ Fataawa Ibn Baaz (29/196) 

It
says in Fataawa al-Lajnah ad-Daa’imah: If the apostate comes back to
Islam, he does not have to make up the prayers, fasts and zakaah that he
failed to do during the time of his apostasy. 

The righteous deeds that he did as a Muslim before apostatising are not
nullified by his apostasy if he comes back to Islam, because Allah, may He
be glorified, has made their nullification dependent upon his dying as a
disbeliever. Allah, may He be glorified and exalted, says (interpretation of
the meaning):


“Verily, those who disbelieve, and die while they are
disbelievers, it is they on whom is the Curse of Allah and of the angels and
of mankind, combined”


[al-Baqarah 2:161]


“And whosoever of you turns back from his religion and dies
as a disbeliever, then his deeds will be lost in this life and in the
Hereafter”


[al-Baqarah 2:217
]. 

End quote from Fataawa al-Lajnah ad-Daa’imah (2/9) 

Based on that, if the situation is as you described, and you have repented
from apostasy and come back to the religion of Islam, and you have given up
all other religions, then you do not have to make up what you omitted
deliberately of prayer and fasting, or the days when you did not fast during
Ramadan because of your menses, apart from the first year and the years that
followed it. 

You have to keep on asking Allah for forgiveness and do a lot of
supererogatory acts of worship, as well as persisting in praying and fasting
in the future, and not being careless about it. 

We
ask Allah to guide us and you, and to enable us to do that which He loves
and which pleases Him, and to remain steadfast in adhering to His religion
until death. 

And Allah knows best.