السلام عليكم ورحمة الله وبركاته
Most of those who tend to attack islam and muslims know the truth, but they are way too ego to admit it..
(Surat Al-Baqara 2) Do you (faithful believers) covet that they will believe in your religion inspite of the fact that a party of them (Jewish rabbis) used to hear the Word of Allâh [the Taurât (Torah)], then they used to change it knowingly after they understood it? (75)
(Surat Al-Baqara 2) Mankind were one community and Allâh sent Prophets with glad tidings and warnings, and with them He sent the Scripture in truth to judge between people in matters wherein they differed. And only those to whom (the Scripture) was given differed concerning it after clear proofs had come unto them through hatred, one to another. Then Allâh by His Leave guided those who believed to the truth of that wherein they differed. And Allâh guides whom He wills to a Straight Path. (213)
(Surat Ash-Shura 42) He (Allâh) has ordained for you the same religion (Islâmic Monothesim) which He ordained for Nûh (Noah), and that which We have revealed to you (O Muhammad SAW), and that which We ordained for Ibrahîm (Abraham), Mûsa (Moses) and 'Īsā (Jesus) saying you should establish religion (i.e. to do what it orders you to do practically), and make no divisions[] in it (religion) (i.e. various sects in religion). Intolerable for the Mushrikûn[] , is that (Islâmic Monothesim) to which you (O Muhammad SAW) call them. Allâh chooses for Himself whom He wills, and guides unto Himself who turns to Him in repentance and in obedience. (13) And they divided not till after knowledge had come to them, through (selfish) transgression between themselves. And had it not been for a Word that went forth before from your Lord for an appointed term, the matter would have been settled between them. And verily, those who were made to inherit the Scripture [i.e. the Taurâh (Torah) and the Injeel (Gospel)] after them (i.e. Jews and Christians) are in grave doubt concerning it (i.e. Allâh's true religion — Islâm or the Qur'ân). (14)
If Allah SWT is willing he will guide them to his way.. Other than that, you don't have to feel sorry for them.
(Surat Al-Qasas 82) Verily! You (O Muhammad SAW) guide not whom you like, but Allâh guides whom He wills. And He knows best those who are the guided[] (56)
All we can do is give advise to those who dont know, and leave the rest to Allah..
(Surat An-Nisa 4) They (hypocrites) are those of whom Allâh knows what is in their hearts; so turn aside from them (do not punish them) but admonish them, and speak to them an effective word (i.e. to believe in Allâh, worship Him, obey Him, and be afraid of Him) to reach their innerselves (63)
And those who refuse to follow the truth after knowing it...
(Surat Al-Baqara 2) Verily, those who disbelieve, it is the same to them whether you (O Muhammad Peace be upon him ) warn them or do not warn them, they will not believe. (6) Allâh has set a seal on their hearts and on their hearings, (i.e. they are closed from accepting Allâh's Guidance), and on their eyes there is a covering. Theirs will be a great torment. (7)
(Surat Al-Baqara 2) And they say, "Our hearts are wrapped (i.e. do not hear or understand Allâh's Word)." Nay, Allâh has cursed them for their disbelief, so little is that which they believe. (88) And when there came to them (the Jews), a Book (this Qur'ân) from Allâh confirming what is with them [the Taurât (Torah) and the Injeel (Gospel)], although aforetime they had invoked Allâh (for coming of Muhammad Peace be upon him ) in order to gain victory over those who disbelieved, then when there came to them that which they had recognised, they disbelieved in it. So let the Curse of Allâh be on the disbelievers. (89)