OSAS is the belief you can force God to give you eternal life with a one time decision.
Unlike the Bible, which says that you can be cut off.
Eternal life doesn't begin until the resurrection, before the resurrection you can walk away from salvation and God won't stop you.
You really need to learn the difference between what God is able to do and what God will do.
2 Timothy 2:12
12 If we suffer, we shall also reign with him: if we deny him, he also will deny us: |
Yes, God's promises are PROMISES, and His PROMISES really do mean something.
One of His promises is that He will change His mind from life to death for a person that leaves righteousness to do wickedness.
You seem to think a seal is something it is not.