All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
If we presume that any matter which Allah has legislated, whether it is permissible, or recommend, or obligatory, includes any disadvantage, then its advantages are when compared to its disadvantages.
It is not permissible to describe it that it is a pure evil, because all the rulings of Allah are all good, but the difficulties that the person who is obliged to carry out these religious obligations may face, are considered as evil in this regard.
Ibn Al-Qayyim said in his book Shifaa’ Al-'Aleel:
"The one who is most knowledgeable [i.e. the Prophet ] about Him said: “Evil is not ascribed to You (Allah)”, He (Allah) does not create anything that is purely evil in all aspects. Rather, all that He has created has a benefit in it and a wisdom, even if there is a partial additional evil in some of it. As regards a completely evil matter that is absolutely evil in all aspects, then Allah, exalted be He, is free from this and this is not ascribed to Him.” [End of quote]
Declaring a Muslim as a Kaafir (non-Muslim or a disbeliever) is not an easy matter. Therefore, it is not correct to judge him as a Kaafir just for uttering these words. It is possible that he intended a meaning that does not necessitate Kufr. In the example you mentioned, it may be that he meant that a girl, at this age, cannot bear sexual intercourse, and that she may be harmed if the husband consummates the marriage with her while she is not able to have sexual intercourse. He may also have meant that she is not mature and not yet prepared to fulfill her task as a housewife, for example.
With regard to the Attributes of Allah Almighty, it is a matter of the Unseen and a Muslim must refer to Islamic texts in this regard. It is forbidden for a Muslim to describe his Lord with what He did not describe Himself in His Book or on the tongue of His Messenger .
Describing the face of Allah resemble the image of Aadam is a great evil and an aberrant sin. The same applies to likening Him [to any of His Creatures] in any manner. It was reported that Na’eem ibn Hammaad said:
"Whoever resembles Allah to any of His creation has indeed disbelieved ...” [End of quote]
This kind of Takfeer (declaring someone as a non-Muslim) is general, but it is not permissible to declare a specific person as a Kaafir unless the conditions (of declaring him as Kaafir) are met, while there are no impediments for declaring him as such. These criteria (of declaring someone as Kaafir) must be fulfilled. For more benefit on the criteria for declaring someone as a Kaafir, please refer to Fataawa 8106 and 87963.
We hope that you are not affected by whispers in this field of Takfeer because we have already received a question from you about the same context.
Allah knows best.