"You ARE sealed/justified/saved the instant you place your faith/trust/belief in ONLY the death/burial/resurrection of Christ for the forgiveness of ALL your sins = enter eternal life."
Conclusion, in accordance with God's sense of universal justice, every infant or child or adult person for that matter, that experiences death before having had the opportunity to hear and comprehend how to enter eternal life with all sins washed away is, of course, damned.
