Dought & clear, - Conditions for Prayer, - Praying deliberately when one is not taahir is a major sin but it is not kufr.

I know that its not allowed to pray if you have "Janabet" Now if
someone have prayed with "Janabet" then what is the ruling of Islam on
him. Let me make you the setuation little more clear. This person's
age was 20~21. And he went with his dad to mosque, over there his
father "Ordered" him to conduct Jamat (Nimaz). Now in this setuation
the guy was not able to tell his dad that he is in "Janabet" and needs
Ghusal, so he did the "Wozoo" and conducted the jamat. Now from
inside, he is broken totaly, and worried about his this SIN, he read
in one book that if you conduct "Salat" wihtout WOZOO, then you are
OUT OF ISLAM !!! .... Now in this setuation what he has to do ? Is he
Out of ISLAM or NOT ? How he can overcome of his this SIM ... and do
TOWBA ? Do he need to do his EMAN's TAJDEED ? I will be loooking
forward to hear from your side, a detailed answer. I know that u have
said that ask only related to Ramazan questions, but I have discovred
your site now. So I hope that when u will have time then u will replay
for this IMPORTANT question. My friend is really in Mental Trouble due
to what happned.
Praise be to Allaah.
Firstly:
It is well known and no Muslim has any excuse for not knowing that
purification from impurity, whether minor or major, is obligatory and
is a condition of prayer being valid. Whoever prays without purifying
himself, whether deliberately or by mistake, his prayer is invalid and
he has to repeat it; if it is done deliberately then he has committed
a major sin.
Shaykh al-Islam Ibn Taymiyah (may Allaah have mercy on him) said:
The Muslim should not pray facing any direction other than the qiblah,
or without doing wudoo', bowing and prostrating. Whoever does that
deserves to be criticized and punished. End quote.
Manhaaj al-Sunnah al-Nabawiyyah, 5/204
There is a stern warning issued to one who does that:
It was narrated from 'Abd-Allaah ibn Mas'ood (may Allaah be pleased
with him) that the Prophet(peace and blessings of Allaah be upon him)
said: "It was ordered that one of the slaves of Allaah be flogged in
his grave with one hundred lashes, but he kept asking until it was
reduced to a single blow. So he was given a single blow, then his
grave was filled with fire. When he came round, he said: 'Why did you
flog me?' It was said to him: 'You offered one prayer without being
taahir, and you passed by one who was being wronged and did not help
him.'" Narrated by al-Tahhaawi inMushkil al-Athaar, 4/231; classed as
hasan by al-Albaani inal-Silsilah al-Saheehah, 2774.
Secondly:
The scholars are agreed that whoever prays without being taahir
because he believes that it is permissible or out of disrespect is a
kaafir. He should be asked to repent, and if he repents, all well and
good, otherwise he should be executed.
But if he prays without wudoo' out of negligence, not because he
thinks it is permissible or out of disrespect, Imam Abu Haneefah (may
Allaah have mercy on him) is of the view that this is also kufr, but
the majority of scholars are of the view that he is not a kaafir,
rather he has committed a major sin.
Al-Nawawi (may Allaah have mercy on him) said:
If he knows that he is impure and that it is haraam to pray when one
is impure, then he has committed a grave sin, but he does not become a
kaafir thereby in our view, unless he regards that as permissible. But
Abu Haneefah said: He has committed kufr because of his disrespect.
Our evidence is that it is a sin so it is akin to zina and the like. End quote.
Al-Majmoo'(2/84);Rawdat al-Taalibeen, 10/67
See the Hanafi view inal-Bahr al-Raa'iq, 1/302, 151; 5/132;Haashiyat
Ibn 'Aabideen, 3/719
The one who has prayed without purifying himself has to repent and
seek forgiveness, and resolve not to do such a thing again, then he
should repeat the prayer that he offered without purifying himself.
Allaah accepts the repentance of those who repent to Him. And he does
not have to enter Islam anew.
And Allaah knows best.