So Jesus Christ is indeed "the propitiation…for the sins of the whole World."5498 This means, as the Geneva Bible comments, that Christ is the reconciliation "of them who have embraced the Gospel by faith in all ages, degrees, and places. For there is no salvation without Christ."
Calvin adds in his comment: "The expiation made by Christ extends to all who by faith embrace the Gospel…. John's purpose was only to make the blessing common to the
whole Church. Therefore, under the word 'all' [in the phrase ‘for the sins of all the World’ or ‘the whole World’], he does not include the reprobate but refers to all who would believe and those who were scattered through various regions of the Earth. For, as is meet, the grace of Christ really is made clear — when it is declared to be the only salvation of the World."