I'm going to try this one more time, so please try to concentrate:
When God makes a Promise, if you do that which He commands be done to receive that Promise, receiving the Promise is based upon His Integrity to fullfill His Promise, not based upon your feeble abilities to hold onto that which He Gives to you ... He makes the Promise, He keeps that Promise and keeps you receiving that Promise ... even as by fire in some cases (that's very scriptural and you can dig it out I sure), but the Salvation is based upon His Promise, not upon all that you can do.
Consider the following notion:
God can 'see' all of Time as if a panorama to His view. The moment you believe His Promise to save you because you believe in His Deliverer as your Savior, that moment is established forever more, because God made the Promise wihtout provision other than by faith you accept His Deliverer.
Try to avoid the usual pretzelization where you try to establish some exception clause to nullify His Promise explained to you.
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To your way of thinking, is the belief in His Premise something you need to do, or did God decide you were going to do it?