You don't mention Jesus once.

The verse in Exodus has nothing to do with the church. The promises that God made to Israel are not the same promises that God made to the church.

God is always with us even when we're disobedient. We're not saved by keeping God's commandments. We're saved by repenting of our sins and accepting what Jesus did on the cross as payment for those sins. And by accepting Jesus as Lord, we try to do all that Jesus commanded us.