In islam if you want to change something you have to do it by yourself and god (allah) will help you and guide you all the prophets in islam did the same thing 

There is a word in our riligion called الاخذ بالاسباب it means doing the things that might give reasons to change

Our god (allah) won't help us if we stopped doing anything and just hope (allah) will do everything for us 

 In which Surah is this, in which exact phrase? I'll read it here.

I'm asking because religious people sometimes try to sell their culture or views as if it came from religious book, when it's clearly not in their scriptures.

I don't intended to offend you by asking the exact source