Both points are applicable here.
God will handle the infirmed and/or mentally challenged just as He will manage the young and immature.
He will be equally determined to apply His resolve on those NOT following His commandments...as we see here often, concerning baptism, OSAS, universalism, and other new age religion teachings.
He will not compromise His commandments...one iota....be aware.
Compassion, good to hear.
We seem to agree on how much God hates false and/or man worded and/or concluded doctrines, deception and the like.
But, I do think 'the letter of the law' was done away with in favor of t
he 'spirit of the law' and Gods purpose is not only for us to love Him but to love HIS WAYS
But as you basically stated,
Hebrews 4:1
Let us therefore fear, lest, a promise being left us of entering into his rest,
any of you should seem to come short of it.
2 For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.
I would like to add
Hebrews 4:11 Let us labour therefore to enter into that rest, lest any man fall after the same example of unbelief.
12 For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints and marrow,
and is a discerner of the thoughts and intents of the heart.