That would be like a person asking for proof in a certain way and then 'assume' they could remain a non-believer anyway. That doesn't make sense. Thomas doubted and he demanded proof, a specific 'event' was demanded and it was given, That ended any 'doubt' for Thomas as there was no 'threat of punishment'. Today much is said about what grace will and will nor cover as far as sin is concerned, even grave can be 'voided' under certain circumstances.
Miracles of the prophets
When the apostle comes to people, he starts to admonish them, advise them to believe in God alone and abandon their idols and their patrons, other than God alone as the exclusive Patron. Then whosoever God wants to guide, will be guided rightly, while those whom God is not pleased with (wrong-doers), will not receive neither will they accept the guidance.
Then some people will demand of that apostle to show them some miracle : an extraordinary work that cannot be done except by God to prove to them that God confirms the truthfulness of the apostle.
When one sees the truth, what is his need for any miracle? But in case he doubts, then the miracle will make him certain (this is supposed to be the result: that man should believe when he sees the miracle.)
If two men: one sees the miracle and does not believe even then, while the other man has not seen the miracle and eventhen he does not believe; whom is blamed more? The one that sees the miracle and does not believe is more worthy of the blame and more worthy of the punishment; because of his extreme stubbornness.
Miracles of the Prophets
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From what, death or sin? Does death cover all sins?
God saves the believers
People will be saved in many ways (when they exclusively devote themselves to God alone, and follow their apostle):
1- They will be saved from
the punishment of the disgrace (in the life of the world); because God will afflict the disbelievers with the disgrace punishment in the life of the World : like
- the attack of their enemy (like the Israelite in the past by the hand of Nabuchodonosor, then by Titus ...etc; and like Iraq by the hand of the Zionist Americans)
- the earthquake like that of Lot's people, Shuaib's people, Thamood tribe ...etc.
- the hurricanes (like that of Aad tribe: Hood's people)
- the flood like that of Noah's people, and like the drowning of Pharaoh and his host.
2- They will be saved form
the punishment in the afterlife following their death: like Noah's people after they were drowned, their souls were admitted to the Fire; and like Pharaoh's house who were - following their death - exposed day and night to the Fire.
God - be exalted – said, telling about the people of Noah, in the Quran 71: 25
مِمّا خَطِيئاتِهِمْ أغْرِقُوا فَأُدْخِلُوا ناراً
The explanation:
(Because of their sins, they were drowned [in the flood], then were admitted into a Fire.)
It means: Their bodies were drowned in the water, then their souls were admitted into the Fire.
3- And they will be saved from
the punishment in Saqar which is the Fire of Doomsday. Where disbelievers and wrong-doers will be tormented forever.
God - be exalted - said in the Quran 35: 36
وَالَّذِينَ كَفَرُواْ لَهُمْ نَارُ جَهَنَّمَ لاَ يُقْضَى عَلَيْهِمْ فَيَمُوتُواْ وَلاَ يُخَفَّفُ عَنْهُمْ مِّنْ عَذَابِهَا كَذَلِكَ نَجْزِي كُلَّ كَفُورٍ
The explanation:
(But those who unbelieve, for them [in the Hereafter] will be the fire of Hell; it shall not be decreed for them to die, nor shall its torment be lightened for them. Thus do We reward every unbeliever [and ungrateful one.])
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If John's parents were very old then Mary (and Joseph) would also have been well on in years before Jesus was born, an older couple rather than a young couple (bride especially).
John Baptist was older than Jesus by some years
Zacharia the husband of Mary's aunt: the sister of her mother, so Zacharia became the guardian of Mary after her mother brought her to the men of the custodian of God's house at Jerusalem, and she demanded one of them be responsible about her.
Zacharia became the guardian of Mary when she was somewhat older child and her mother wanted to fulfil her vow concerning her to be a servant of the House of God.
Zacharia built for her a private chamber in the House of God, and Mary started to worship God there; the chamber was with one door, the keys of which were kept with Zacharia alone, and there was a high window in that private chamber; only Zacharia goes to see and take care about her as he became her guardian.
Kind-hearted men started to throw fruits and food to Mary through the window of her chamber.
So whenever Zacharia entered her chamber of worshipping, he would find fruits and food; and he asked her: From where is all this fruit and food? Mary answered him: It is from God; He makes the kind-hearted merciful towards me and they throw such fruit and food to me. God provides without restriction to whomever He please.
So
at that time and place, Zacharia - who was without son and was elderly and his wife was barren and sterile - prayed God to give him a son to inherit of him the custodianship of the House of God; because he did not trust the others to be the custodian.
As in the Quran 3: 37-38
فَتَقَبَّلَهَا رَبُّهَا بِقَبُولٍ حَسَنٍ وَأَنبَتَهَانَبَاتًا حَسَنًا وَكَفَّلَهَا زَكَرِيَّا كُلَّمَا دَخَلَ عَلَيْهَا زَكَرِيَّا الْمِحْرَابَوَجَدَ عِندَهَا رِزْقاً قَالَ يَا مَرْيَمُ أَنَّى لَكِ هَذَا قَالَتْ هُوَ مِنْ عِندِاللّهِ إنَّ اللّهَ يَرْزُقُ مَن يَشَاء بِغَيْرِ حِسَابٍ
هُنَالِكَ دَعَا زَكَرِيَّا رَبَّهُ قَالَ رَبِّهَبْ لِي مِن لَّدُنْكَ ذُرِّيَّةً طَيِّبَةً إِنَّكَ سَمِيعُ الدُّعَاء
The explanation:
(Rightgraciously did her Lord received the [child] with gracious favor: He made her grow a goodly growth: He assigned her to Zachariah to take charge of her: Everytime that Zachariah entered into her prayer chamber, he found her having a provision. He said: "O Mary! How [comes] this to you?" She said:"From God: for God offers provision to whom He pleases, withoutstint."
"There and by then", Zachariah prayed to his Lord [and said:] "My Lord,offer to me, out of Your [grace], an offspring that is 'good and righteous';for surely, You are the All-Hearing of the prayer."
Then while he stood praying in the prayer chamber, the angels called to him: "God does give you the glad tidings of John – believing and confirming [Jesus whois] a 'Word from God' – and [he will be] noble, chaste and a prophet among therighteous."
[Zachariah]said: "My Lord! How can I have a son, the while I have attained elderly,and my wife is barren!?" [The angel] said: "[It will be] so; [for]God does whatever He pleases.")
Therefore, it seems from this that John Baptist is some years older than Jesus.
The other point is when Mary became pregnant with Jesus, there had been none that contacted her sexually, but she was engaged to Josephe the carpenter; then after she gave birth to Jesus, she then married Joseph.
So Jesus was born miraculously without father according to God's will and might; because God before had created Adam without father or mother.