Is money earned from Murabaha shares, following a fatwa permitting them and delaying the purchase of land, then reinvesting it in pure (non-interest-bearing) shares, considered money with a suspicion of usury, and is fearing it a delusion or a path to salvation?

Your caution and fear of usury are commendable, but they should not reach the point of obsessive doubt. Permissible transactions, borrowing for a need with the intention of repayment, and legitimate investment are all permissible. Repulsion from religion was mentioned in the context of those who intentionally commit treachery or take without need. Therefore, you are not obligated to expedite the repayment of the loan to the bank, and if you do so with the intention of clearing your conscience, there is no harm. It is better and more absolving for you to leave what you find doubtful due to scholarly disagreement, based on the saying of the Prophet, peace and blessings be upon him: "Whoever guards against doubtful matters, safeguards his religion and his honor," and his saying: "Righteousness is that which your soul feels tranquil about, and sin is that which wavers in your soul, even if people give you a fatwa (definition) about it."