Dought & clear, - The non Muslims ask who created Allaah.

I tell non-Muslims that Allah created everything in this universe.
They ask me who created Allah ? How can Allaah have been there since
the beginning?
How can I answer them ?
Praise be to Allaah.
This question which the non Muslims have asked you is inherently false
and self-contradictory. If we were to say – for the sake of argument –
that someone created Allaah, then they would ask you, Who created the
creator of the Creator? Then, who created the creator of the creator
of the creator?! And so on, ad infinitum. This is irrational and
impossible.
All of creation goes back to the Creator Who created all things. No
one created Him; He created everything other than Himself. This is
what makes sense and is logical. This Creator is Allaah, may He be
glorified and exalted.
With regard to what our religion tells us, the Prophet (peace and
blessings of Allaah be upon him) told us about this question, where it
comes from, and how to respond to it.
Abu Hurayrah (may Allaah be pleased with him) said: the Messenger of
Allaah (peace and blessings of Allaah be upon him) said: "People will
keep on asking questions until someone will say, 'Allaah created the
universe, but who created Allaah?' Whoever encounters anything like
that, let him say, 'Amantu Billaah (I believe in Allaah).'"
The Messenger of Allaah (peace and blessings of Allaah be upon him)
said: "The Shaytaan will come to one of you and say, 'Who created the
heaven? Who created the earth?' He will say, 'Allaah'" – then he
mentioned something similar (to the previous report), and added, "And
His Messengers." [i.e., amantu Billaah wa Rusulihi = I believe in
Allaah and His Messengers]
The Messenger of Allaah (peace and blessings of Allaah be upon him)
said: "The Shaytaan will come to one of you and say, 'Who created such
and such?' until he says to him, 'Who created your Lord?' When it
reaches that stage, let him seek refuge with Allaah [say A'oodhu
Billaahi min ash-shaytaan ir-rajeem = I seek refuge with Allaah from
the accursed Shaytaan] and stop thinking about it."
The Messenger of Allaah (peace and blessings of Allaah be upon him)
said: "The Shaytaan will come to a person and say, 'Who created such
and such…'" and he narrated the whole report. (Imaam Muslim, 134).
In these ahaadeeth (Prophetic narrations) we see:
Where this question comes from – from the Shaytaan;
How to deal with it, which is:
to stop pursuing these thoughts and these tricks of the Shaytaan
to say, "I believe in Allaah and His Messengers"
to seek refuge with Allaah from the Shaytaan.
It was also reported that one should spit drily three times to one's
left, and recite Qul Huwa Allaahu ahad.
(See "Problems and Solutions" in the Shaykh's Books section of this website).
3. With regard to the prior existence of Allaah, our Prophet (peace
and blessings of Allaah be upon him) has told us about this, for
example:
He (peace and blessings of Allaah be upon him) said: "O Allaah, You
are the First and there is nothing before You; O Allaah, You are the
Last and there is nothing after You." (Narrated by Muslim, 2713)
He (peace and blessings of Allaah be upon him) said: "Allaah existed
when there was nothing apart from Him." According to another report:
"There was nothing before Him." (Narrated by al-Bukhaari; the first
report 3020; the second report 6982).
This is in addition to what is stated in the aayaat (verses) of the
Qur'aan. The believer believes without a doubt, the non Muslim denies
and the munaafiq (hypocrite) doubts. We ask Allaah to grant us sincere
and certain faith with no doubts. And Allaah is the Source of
strength.