The evidence is abundant, and we mention some of them:
First evidence:
The evidence of origination (bringing into existence), and its meaning: That everything that is Muhdath (brought into being after it did not exist) must have a producer, a Moojid (originator), so everything that is brought into existence is direct evidence of the originator.
For example: Let's look at Google. There must be an internet to use Google, in order for there to be internet we need our computer, phones or tablets, and for the computer, well, someone had to build it, and there are things that depend on electricity.
The next question is Google depends on the Internet, the Internet depends on the computer, the computer depends on us and electricity. The process goes on and on. We can't have infinite dependent things. There's a place where it must stop so it can be logical, and that is the necessary and self-sufficient independent being who is God.
Second evidence:
The evidence of tendency (and attention), which is that everything in existence carries a degree of functional complexity, i.e. performs a specialized function and a specific task, and functional complexity is a guide to making and bringing into existence.
So there must be an originator.
For example: A light bulb consists of: a lamp filament, a lead wire that conducts electricity to the filament, inert gas which protects the wick and doesn’t interact with the electricity, and glass which prevents air entering or inert gas from exiting, otherwise the wick would have burned. And the lamp base that connects the bulb to the rotary and forms a path of electric current.
Here the light bulb is a system of complexity that cannot be simplified, and therefore has a primary mental (logical) significance which gives meaning to a mastered manufacture (production) which denies the elaborate workmanship of the lamp or assumes its appearance by chance is the one who demands evidence of this.