Sorry brother in all due respect there is no scripture to support anything that you have posted above to say that suicide is not sin and can be forgiven. It is simply not biblical.
But there are plenty of verses which speak about a God of compassion.
Exodus 34:6 says that God proclaimed his name to Moses - the compassionate and gracious God.
Psalms 103:8 says that God is compassionate and gracious.
Psalms 116:5 says that our God is full of compassion.
Psalms 145:9 says that the Lord has compassion on all he has made.
Isaiah 49:13 says that the Lord has compassion on his afflicted ones.
Lamentations 3:22 says that God's compassion never fails.
and so on.
Isaiah 42:3 and Matthew 12:20 say that God will not break a bruised reed nor snuff out a smouldering wick.
Isaiah 61:1 says that God sent his servant to bind up the broken hearted.
1 Corinthians 13:4-7 says that love is kind ...... always protects, always hopes.
1 John 4:8 says that God IS love.
As Scripture reveals God's character to be one of kindness, compassion, tenderness, love - as well as grace and mercy - can we really say that if a person who is very depressed or mentally ill takes their own life, while they are in this state and their minds not well, or clear; God will then say "too bad, hell for you; you could not repent."?
I don't believe so.
Not meaning disrespect, but please don't look so hard at the individual words/passages of Scripture that you miss the big picture and what Scripture reveals about God. In other words, if there is not a verse to back up a teaching or advise on a moral dilemma, this does not mean that it is wrong and that God would be against it.
Who should we believe, your words or God's Word?
I believe what God's word says about the character of God - he has revealed his character to us through his word, and ultimately through Jesus. Because of what I know about the character of God, I cannot accept that he would deal harshly with people who take their on lives due to illness, accident, or who enduring the hell of alcoholism and/or abuse and can see no way out.
Such people may not even believe in God, judging that he has abandoned them and done nothing to help.
What I can't work out is why anyone would think suicide is not a sin and would be forgiven when the bible says it is sin that cannot be forgiven.
But it doesn't say that suicide is a sin, or address the question of mental illness.
And it does say plenty about God who is love and full of compassion.
Again, Jesus said that the only unpardonable sin is blasphemy against the Holy Spirit. He doesn't mention suicide at all.
And are you saying that if a Christian who knows God falls ill, or into despair, and ends their life - maybe not even meaning to - that God will say, "never mind your faith, love and everything that has gone before; that one sin can't be forgiven, so it won't be, so you're going to spend eternity in hell"?
There is no Scripture to support that. Jesus said that nothing can snatch us from our Father's hands, and Paul says that NOTHING can separate us from Gd's love.