Awesome. Thank you. Here's how you can know:
To account for ultimate cause, the only options (via deductive elimination*) are as follows:
1. Chance
2. Intent
3. A material cause.
#3. invokes an infinite regress, which is completely irrational. "Turtles All The Way Down" applies equally to cosmological claims as it does to theistic claims.
#1. "Chance" is not a thing-in-itself. Voltaire argued that chance is a placeholder for "we don't know." You need material dice to actually roll them to begin with. Thus, chance is eliminated.
Thus, deductively speaking, "Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."
Conclusion: It was done intentionally on-purpose.
*Meaning that, until you can actually bring a fourth option (or more), then all rational options have been cited.
Welcome to Deism. Atheism has been falsified, yadda yadda.