God doesn't fail us. He keeps His side of the bargain. On the contrary, it's us/humans who fail him. A covenant takes both hands to clap. The parable of the Sower is testament to that.
Some people go back into the world.
2 Peter 2:22
Mark 4:19 And the cares of this world, and the deceitfulness of riches, and the lusts of other things entering in, choke the word, and it becometh unfruitful.
You are truly saved lock, stock & barrel when you finally make it to Heaven. On this side though, you need to fight the good fight & get through the narrow door.
Rev 3:11 ....... so that no one may seize
your crown.