No — not by mere sincere acceptance alone.

In Jain Dharma, even the 5 mahāpāp are not cleansed just by saying “I accept my mistake.” They require true repentance, confession, remorse, pratikraman, atonement, and firm resolve not to repeat them.

So the strict Jain answer is:

• Sin is not washed away by words alone
• Sincere inner repentance is necessary
• Karmic bondage is removed only through real purification
• The 5 mahāpāp are extremely grave, so great care, penance, and restraint are needed

Strictest answer: Yes, purification is possible; no, automatic forgiveness is not guaranteed by acceptance alone.