What's the difference between asking Mary to pray for you in time of need or any other friend or acquaintance?
I am fairly new in my walk with Christ but in my understanding the difference is that Mary is dead whereas friends and acquaintances are alive. I would not ask my deceased grandmother to pray for me either.
You don’t believe that Mary has eternal life?
If so, what chance do any of us have?
Why not? It's perfectly scriptural - 2Macc 15:12-16
29 Jesus answered and said to them, “You are mistaken, not knowing the Scriptures nor the power of God. 30 For in the resurrection they neither marry nor are given in marriage, but are like angels of God[b] in heaven. 31 But concerning the resurrection of the dead, have you not read what was spoken to you by God, saying, 32 ‘I am the God of Abraham, the God of Isaac, and the God of Jacob’?[c] God is not the God of the dead, but of the living.” 33 And when the multitudes heard this, they were astonished at His teaching. -- Matthew 22:29-33
20 Now Martha, as soon as she heard that Jesus was coming, went and met Him, but Mary was sitting in the house. 21 Now Martha said to Jesus, “Lord, if You had been here, my brother would not have died. 22 But even now I know that whatever You ask of God, God will give You.”
23 Jesus said to her, “Your brother will rise again.”
24 Martha said to Him, “I know that he will rise again in the resurrection at the last day.”
25 Jesus said to her, “I am the resurrection and the life. He who believes in Me, though he may die, he shall live. 26 And whoever lives and believes in Me shall never die. Do you believe this?”
27 She said to Him, “Yes, Lord, I believe that You are the Christ, the Son of God, who is to come into the world.” -- John 11:20-27