What is the only way to get into God's heaven?
The only way into God's heaven is through what Christ accomplished and profits on our behalf, not through any fleshly work. Circumcision, baptism, church membership, or anything a person does cannot save; depending on such works as part of salvation cancels the work of the cross, for Christ finished everything needed on the cross.
Les teaches that anyone doing something to fulfill salvation, or put frosting on the cake, is as lost as can be, because the Book says so. Christ can profit you nothing if you add fleshly effort. The only way anyone gets into God's heaven is because of what Christ profits us on our behalf. So people must be warned not to depend on anything they can do—circumcision, church membership, baptism, or anything in the flesh—as part of salvation, because that cancels the work of the cross. When Christ said, "It's finished," He meant it; everything needed was accomplished on that cross.