This is in response to an anonymous poster who commented in my last post, which is found here. According to his/her comment (written in red):
What is in your heart will show in your behavior.
43 of the GIRM "In the Dioceses of the United States of America, they [the faithful] should kneel beginning after the singing or recitation of the Sanctus (Holy, Holy, Holy) until after the Amen of the Eucharistic Prayer except when prevented on occasion by ill health, or for reasons of lack of space, of the large number of people present, or for another reasonable cause."
Another liturgical abuse, discussed in some detail here:
The following is my response:
GIRM 43 further goes on to say the following (the bold is my emphasis):
However, those who do not kneel ought to make a profound bow when the Priest genuflects after the Consecration. The faithful kneel after the Agnus Dei (Lamb of God) unless the Diocesan Bishop determines otherwise. [Sacrosanctum Concilium 40; Varietates legitimate 41]
GIRM 43 cites Sacrosanctum Concilium 40, which states (the bold is my emphasis):
40. In some places and circumstances, however, an even more radical adaptation of the liturgy is needed, and this entails greater difficulties. Wherefore:
1) The competent territorial ecclesiastical authority mentioned in Art. 22, 2, must, in this matter carefully and prudently consider which elements from the traditions and culture of individuals peoples might appropriately be admitted into divine worship. Adaptations which are judged to be useful or necessary should then be submitted to the Apostolic See, by whose consent they may be introduced.
2) To ensure that adaptations may be made with all the circumspection which they demand, the Apostolic See will grant power to this same territorial ecclesiastical authority to permit and to direct, as the case requires, the necessary preliminary experiments over a determined period of time among certain groups suited for the purpose.
3) Because liturgical laws often involve special difficulties with respect to adaptation, particularly in mission lands, men who are experts in these matters must be employed to formulate them.
The Neocatechumenal Way was in an "ad experimentum" for a period of five years, in which it has become the norm not to kneel, but to stand. As for the Varietates legitimate, this is what it stated (the bold is my emphasis):
54. For the celebration of the eucharist, the Roman Missal, "while allowing...for legitimate differences and adaptations according to the prescriptions of the Second Vatican Council", must remain "a sign and instrument of unity"  of the Roman rite in different languages. The General Instructions on the Roman Missal foresees that "in accordance with the constitution on the liturgy, each conference of bishops has the power to lay down norms for its own territory that are suited to the traditions and character of peoples, regions and different communities,"  The same also applies to the gestures and postures of the faithful,  the ways in which the altar and the book of the Gospels are venerated,  the texts of the opening chants,  the song at the preparation of the gifts  and the communion song,  the rite of peace,  conditions regulating communion with the chalice,  the materials for the construction of the altar and liturgical furniture,  the material and form of sacred vessels,  liturgical vestments.  Epscopal conferences can also determine the manner of distributing communion. 
As you can see, the GIRM allows certain differences and adaptions to the Eucharist with the permission of the Holy See. Thus, the Neocatechumenal Way practices a valid liturgy approved by the Holy See. The Way is not in violation of the GIRM.