If they believed then thats evidence they had been born again and no longer in the flesh. Otherwise they which be in the flesh cannot believe because that pleases God
Not according to any passage
Hebrews 11:6 (NASB 95) — 6 And without faith it is impossible to please Him, for he who comes to God must believe that He is and that He is a rewarder of those who seek Him.
Those without faith are not regenerated.
John 3:36 (NASB 95) — 36 He who believes in the Son has eternal life; but he who does not obey the Son will not see life, but the wrath of God abides on him.”
John 5:40 (ESV) — 40 yet you refuse to come to me that you may have life.
John 3:18 The one who believes in him is not judged, but the one who does not believe has already been judged, because he has not believed in the name of the one and only Son of God.
Mark 16:16 The one who believes and is baptized will be saved, but the one who refuses to believe will be condemned.
John 8:24 Thus I said to you that you will die in your sins. For if you do not believe that I am he, you will die in your sins.”
1 John 5:12 The one who has the Son has the life; the one who does not have the Son of God does not have the life.
1 John 5:10–13 (The one who believes in the Son of God has the testimony in himself. The one who does not believe God has made him a liar, because he has not believed in the testimony that God has testified concerning his Son.) And this is the testimony: that God has given us eternal life, and this life is in his Son. The one who has the Son has the life; the one who does not have the Son of God does not have the life. These things I have written to you who believe in the name of the Son of God, in order that you may know that you have eternal life.