Friendship with God is unavailable to those who find the idea incredible and/or despair of it

"just as friendship with a person would be impossible if one disbelieved in, or despaired of, the possibility of his fellowship or familiar intercourse, so too, friendship with God, which is charity, is impossible without faith, so as to believe in this fellowship and intercourse with God, and to hope to attain to this fellowship."

"sicut aliquis non posset cum aliquo amicitiam habere, si discrederet vel desperaret se posse habere aliquam societatem vel familiarem conversationem cum ipso; ita aliquis non potest habere amicitiam ad Deum, quae est caritas, nisi fidem habeat, per quam credat huiusmodi societatem et conversationem hominis cum Deo, et speret se ad hanc societatem pertinere."

     St. Thomas Aquinas, Summa theologiae I-II.65.5.Resp., in the FEDP (or Shapcote) translation.  On the other hand, the requisite faith and hope must be infused!