Is God Limited?

I hear some say... A man has to hear the gospel, join a church and be baptized, to be saved?... Then how do you explain the thief on the cross?... The man was a convicted criminal, didn't believe, never went to church, wasn't baptized and was regenerated and saved on a cross?... I hear murmurings well he was a special case... We are all special cases... Can God save a man that has never heard it?... Are we limiting God?... If a man is regenerated during a sermon by hearing the gospel then it is not the gospel that saves the man but by the power of God... God is not limited... I have son age 42 that loves the Lord and was born deaf, he can't hear the gospel, I didn't teach him... So he can't say Lord I believe... A saved man!... What of those with disabilities that can't hear or understand or those because of circumstances in life never heard it, are they hell bound?... I posted an OP on here of a people that had no contact from the outside world and any plan to contact them was met with violence... They just want to be left alone... Man maybe be limited but God never is!... So does God need a man to save one?... Because God is not limited he sent one, his Son... Jesus Christ!... Brother Glen