In the modern world scientific proof is the standard for separating truth from false. If there is no scientific proof for something, it is considered false. But there are many truths which may not have scientific proofs. For example everyone will agree that child sex is wrong but it cannot be scientifically proven. The most widely accepted theory of how the universe came into existence is the Big Bang model. Based on a number of different scientific observations, physicists have concluded that the universe sprang into existence out of nothing about 14 billion years ago. The most immediate question that comes to mind is: Who or what caused the Big Bang? Big Bang holds that universe suddenly came into existence from nothing. According to Big bang theory so many factors were fine tuned to cause a universe with life as if there is an intelligent designer behind it.
Cosmological constant controls the expansion speed of the universe. To get the right balance, the cosmological constant must be fine-tuned to something like 1 part in 10120. If we increased the strength of gravity by 1 part in 1034 universe couldn't have life sustaining planets. There are many factors like this which points to an intelligent designer, God