THAT IS A FALSE STATEMENT!!
You must qualify the word "whosoever" and they are those whom the Father gave to Jesus. ONLY those whose sins Christ redeemed will call on the name of the Lord. Matthew 1:21.
Romans 3:10-11 reads:
10 As it is written, There is none righteous, no, not one:
11 There is none that understandeth, there is none that seeketh after God.
If no one seeks after God who then can be saved? Well, Only those whom the Father gave to Jesus! So you see, it is impossible for Christ to provide salvation for the whole world.
To God Be The Glory