Here are a couple of the "if's" ignored by OSAS:
John 8:31
31 Then said Jesus to those Jews which believed on him, If ye continue in my word, then are ye my disciples indeed; KJV
John 8:52
52 Then said the Jews unto him, Now we know that thou hast a devil. Abraham is dead, and the prophets; and thou sayest, If a man keep my saying, he shall never taste of death. KJV
1 John 2:24-25
24 Let that therefore abide in you, which ye have heard from the beginning. If that which ye have heard from the beginning shall remain in you, ye also shall continue in the Son, and in the Father.
25 And this is the promise that he hath promised us, even eternal life.
KJV
No man or external power can snatch or remove us from the hands of our Savior; but we by choice can walk away from His word and His truth for many reasons. Living a Christian life is not easy and anyone who says it is easy is living in self-deception. What is so difficult about living a Christian life?
Matthew 16:24-28
24 Then said Jesus unto his disciples, If any man will come after me, let him deny himself, and take up his cross, and follow me.
25 For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.
26 For what is a man profited, if he shall gain the whole world, and lose his own soul? or what shall a man give in exchange for his soul?
27 For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works.
28 Verily I say unto you, There be some standing here, which shall not taste of death, till they see the Son of man coming in his kingdom.
KJV