Even a small child understands the difference between repentance from a sorrow, and repentance as one sorry.
Those who believe understand and repeatedly experience the first. Such find refuge in the writing of John in his last years when he declares that if a believer sins, they have that advocate.
Those who do not believe but merely want an escape are like those who came to John the Baptizer and he turned them away, declaring they should bring fruit worthy.
John the Baptizer knew the difference between repentance and belief. Did not he say:
11“As for me,
I baptize you with water for repentance, but He who is coming after me is mightier than I, and I am not fit to remove His sandals; He will
baptize you with the Holy Spirit and fire.
12“His winnowing fork is in His hand, and He will thoroughly clear His threshing floor; and He will gather His wheat into the barn, but He will burn up the chaff with unquenchable fire.”
Was John the baptizer teaching that one has to repent to be saved? NOPE
What John the baptizer did was skillfully distinguish between that which is repentance and that which is salvation.
Note: Even those who were repentant could be burned up as "the chaff with unquenchable fire."
However, one who has been baptized with the Holy Spirit is not burned up, but are considered wheat to be gathered into the safety of the barn.
Repentance is important, but it is no guarantee of salvation.