To say that salvation will be given to everyone is to cheapen salvation...there is nothing that you are actually saved from (as hell or the lake of fire) because no one goes to either of those places.
It is certainly available to all...
However, scripture is clear that we have access into grace through faith (Romans 5:1-2, Ephesians 2:8-9); and therefore if anyone does not have faith in Jesus and what He did for them on the Cross, they are not recipients of grace and do not have salvation.
Universalism is a lie from the pit.
It gives to people a false assurance that they will be saved even if they do not go through the right protocols to be saved.
Certain people, believing in it, will not go through those protocols and will not be saved as a result; while they may believe that they will be saved throughout their lives.
It is really a cruel doctrine to say the least. For those who believe in it will be unpleasantly surprised when they pass into the next life and are in for a rude awakening.