Starting with Sura 1, what's a proof or guide?
ok quran have an arguments for existance of god and that there is only one:
the main argument for existence of god is the existence of universe itself.
that was mentioned in many "ayas" that reminds people how elaborate and well designed this universe is
like what is translated like
{
Or were they created by nothing, or were they the creators [of themselves]?
Or did they create the heavens and the earth? Rather, they are not certain.
}
taha sura
{
It is Allah who sends the winds, and they stir the clouds and spread them in the sky however He wills, and He makes them fragments so you see the rain emerge from within them. And when He causes it to fall upon whom He wills of His servants, immediately they rejoice
}
sura al-rom
the proof for existence of one god is very simple.
{
Allah has not taken any son, nor has there ever been with Him any deity. [If there had been], then each deity would have taken what it created, and some of them would have sought to overcome others. Exalted is Allah above what they describe [concerning Him].
}
Surat Al-Mu'minūn
these simple arguments are sufficient to those that are honest. it is not philosphically complicated so that all people can understand.