There are lots of people who profess to have accepted Jesus but have never shown any indication of ever having a real heart change.
And there are lots of people who will accept a simple *I believe in Jesus* as a profession of faith and evidence of salvation.
Matthew 7:15-20
You Will Know Them by Their Fruits
15 “Beware of false prophets, who come to you in sheep’s clothing, but inwardly they are ravenous wolves. 16 You will know them by their fruits. Do men gather grapes from thornbushes or figs from thistles? 17 Even so, every good tree bears good fruit, but a bad tree bears bad fruit. 18 A good tree cannot bear bad fruit, nor can a bad tree bear good fruit. 19 Every tree that does not bear good fruit is cut down and thrown into the fire. 20 Therefore by their fruits you will know them.