Yes the whole gospel of Christ is foolishness as it says in 1 Corinthians. But it is also true and hell is part of that gospel. Would a loving God make a Hell for people who He loved but didn't love Him? That is the classic question among free choice and predestination believers. Yes it seems a difficult question.
The more direct issue to a non-believer is, do you really think that you exist apart from God. Do you really think that life is an accident and that soon you will be dead. The bible says that if Jesus isn't raised from the dead than we might as well eat and drink and party because tomorrow, we die. This is the morbid reality of the athiest. I joined the Army as an athiest and asked for that on the religion field of my dog tag.