What's insanity is trying to argue that a woman created without sin, who then rebells against her creator, bringing a curse upon herself and all mankind is somehow greater.
I can only assume you either have no idea what Original Sin is,
I believe I have a better grasp than you do trying to produce a 'sinless' woman from two very human 'sinful' parents, i.e. Mary's folks. Unless you are now trying to maintain one of them was also sinless????? Luke 3 beginning in v. 23 never mentions this, perhaps you have an extra-biblical source? Again: Romans 3:23 - FOR ALL HAVE SINNED.......
Your logical leaps with Luke 1:48 (being lower than God doesn't mean one is sinful) can wait for another day till you sort out whether sin is beteer than no sin.
The word for 'low or humble' estate is ταπείνωσιν (tapeinōsin) My Greek Word study says the following:
ταπείνωσις (tapeinōsis 5014)
1. humiliation
a lowering, humbling, abasing; lowliness.
2. low estate
a making low, humiliation. in NT, the being brought low, low estate, humiliation.
3. vile
humiliation; here, generally, of humiliation.
ταπείνωσις (tapeinōsis, 5014), -εως, ἡ, (ταπεινόω), lowness, low estate, [humiliation]: Lk. i. 48; Acts viii. 33 (fr. Is. liii. 8); Phil. iii. 21 (on which see σῶμα, 1 b.); metaph. spiritual abasement, leading one to perceive and lament his (moral) littleness and guilt, Jas. i. 10, see Kern ad loc. (In various senses, by Plat., Aristot., Polyb., Diod., Plut.; Sept. for עֳנִי.) [See reff. s. v. ταπεινοφροσύνη.]*
Perhaps you'd care to explain how tapeinōsin which does mean humiliation, low estate, or even vile and which has no other meanings could mean anything else BUT SIN in Luke 1:48? Unless now you're trying to maintain that being pregant with the Son of God is a vile humiliation???? Think man and look at the text. I'm sorry but I'll take the authority of Greek scholars as to what this word means over you.
And Sola Scriptura collapes. Thank you.
(I already answered your question. A lowly state does not need to imply sin. Being a perfect, sinless human being is still more lowly than being God. Anything other than humility before God would be sinful.)