Laws of science
Laws of physics eg. Gravity
Nature in general - plants and animals
Anything that has been designed needs a designer eg. a Car
There is lots of evidence that the world and universe has been designed
If it has been designed it needs a designer
That designer must be God, because of the beauty and complexity of the world
Creation is cruel - animals kill others for food, volcanos, earthquakes etc.
Science has answered many of the questions about how we got here eg. Evolution
Dinosaurs are not mentioned in the Bible, yet we know they existed and formed part of the evolutionary process
Even if you accept that the universe has a designer why does it have to be a good God? It could have been more than one god, or an evil god, or an apprentice god etc.
Ultimately the world IS NOT perfect, it is flawed.
YOU - you were caused by your parents
Everthything we do causes an effect, eg writing, you cause your pen to deposit ink on paper
When looking at the world we see that everything has a cause and effect
Anything caused to exist, such as yourself, must have been caused by something else (eg your grandparents causing your parents and so on.......)
You can't go back infinately through a chain of cause and effect - there has to be a First Cause (what else could have caused the Universe?)
The First Cause is God (who is uncaused himself)
If there is a First Cause, why does it have to be God (eg. science suggests the Universe started through the Big Bang)
Why could the chain of cause and effect not go back infinately? Why does it have to stop?
Look up at the night sky - you will literally see creation in action - a process which is ongoing and does not involve God