Pope Francis says: “God’s mercy has no limits if you go to him with a sincere and contrite heart. The issue for those who do not believe in God is to obey their conscience. Sin, even for those who have no faith, exists when people disobey their conscience.”
In essence he seems to say – if you are convinced in your own mind [sincere in your unbelief] God’s mercy will be extended to you because you are sincere – in your unbelief.
Charles Spurgeon says: “If you sincerely believe a lie, you will suffer the consequences. You must not only be sincere, you must be right.”
I think I will go with Charles, because God’s word says we all have a God given conscience [Rom. 1:19-20]; to believe a lie [another gospel – 2 Cor. 11:3-5] will send you to hell; and without faith it is impossible to please God [Heb. 11:6]. Sincerely!