If you decline the offer of free Salvation by the grace of Jesus Christ you go to hell. Those are the rules whether you like it or not - atheist!
Free would be god just giving you salvation for nothing. But you have to worship him, and obey his laws for him to give you salvation (Revelation 21:8). If you have to do/not do anything for salvation, it is not free.And of course, if we do not accept god's imposition, then we must pay for the sin he so kindly bestowed upon us at birth ( Psalm 51:5).