I am an avid follower but this is an old testament gospel before the cross. Apostle also didn't do a good job by quoting events that happened to Jesus Christ our Lord before he was crucified. You can be delivered at any time, before or after marriage, at which time Christ takes over and lives in us. It is no longer I who lives but Christ who lives in me. The sacrifice of first born (and redemption through animal) is what was replaced by Jesus Christ as the first born of creation when he was sacrificed on the last Altar - the cross.