God has always provided a way—a way for salvation.

He made the promise back in the Garden of Eden.

“I will put enmity between you and the woman, and between your offspring and her offspring; he shall bruise your head, and you shall bruise his heel.” (Gen 3:15)

Jesus is the fulfillment of that promise, and He is the seed. 

God had a plan and provided a way. He is the primary actor, not man. It is His plan and His salvation. We are not the ones who bring it about, but it is only through the body and blood of Jesus. 

John 3:14-15

And as Moses lifted up the serpent in the wilderness, so must the Son of Man be lifted up, that whoever believes in him may have eternal life