And by the same token priests do not feel scripture qualifies them for gender neutral weddings and the law surely underlines that as well.
You are bigging up the status of your opinion which has no support in law. To get any purchase for your argument
Both humanist celebrants and priests have to get qualified for both gender neutral holy matrimony and gender important holy matrimony.
You seem especially dense: what bit of 'Humanist celebrants are not clerics and, therefore, cannot provide the "holy matrimony" you speak of', are you not getting? You also mention 'the law' but marriage law differs within the UK - for example.
In Scotland.
* As Anchorman pointed out earlier, clerics are not permitted to conduct civil marriages.
* Marriages conducted by Humanist celebrants can take place anywhere the celebrant is prepared to conduct the service (hotel, beach, garden etc) - but not on religious premises - and will have immediate legal force without the involvement of a state Registrar.
* Religious ceremonies can also occur anywhere the cleric is prepared to conduct the ceremony.
* Civil marriages involving a state Registrar can occur anywhere that the registration authority permits.
A civil marriage ceremony can take place in a registration office or any other appropriate location (other than religious premises) that has been agreed by the couple and the registration authority, for example a stately home, a boat in Scottish waters or a hillside.
A religious or belief ceremony includes religious beliefs and other belief systems such as humanism. A religious or belief ceremony can be held anywhere (for example on a boat or hillside) as long as the couple can find an approved celebrant. This is someone who is authorised to perform marriages.
https://www.citizensadvice.org.uk/scotland/family/living-together-marriage-and-civil-partnership-s/getting-married-s/In England & Wales.
* Humanist celebrants can also conduct marriages anywhere but these have no legal force in themselves, and a separate civil ceremony conducted by a state Registrar is also required for the marriage to be legal.
* Legal marriages can only take place in premises approved by he registration authorities and, unlike here in Scotland, outdoor marriages in gardens or on a beach are not immediately legal, and if the couple want an outdoor ceremony outwith any approved premises they will also need a separate civil ceremony in an approved fixed structure (which can include permanent gazebos attached to hotels), and only then are they legally married.
Same sex couples can only marry in a religious ceremony, if the religious organisation has agreed to carry out same sex weddings, and the premises have been registered for the marriage of same sex couples. Religious organisations or individual ministers do not have to marry same sex couples. Same sex couples cannot marry in The Church of England or the Church in Wales......
Local authorities in England and Wales may approve premises other than Register Offices where civil marriages may take place. Applications for approval must be made by the owner or trustee of the building, not the couple.
The premises must be regularly open to members of the public, so private homes are unlikely to be approved, since they are not normally open to the public. Stately homes, hotels and civic buildings are likely to be thought suitable. Approval will not be given for open air venues, such as moonlit beaches or golf courses. Generally, the premises will need to be permanent built structures, although it may be possible for approval to be given to a permanently moored, publicly open boat. Hot air balloons or aeroplanes will not be approved......
You can get married by a civil ceremony or a religious ceremony.
In both cases, the following legal requirements must be met:-
the marriage must be conducted by a person or in the presence of a person authorised to register marriages in the district
the marriage must be entered in the marriage register and signed by both parties, two witnesses, the person who conducted the ceremony and, if that person is not authorised to register marriages, the person who is registering the marriage.
https://www.citizensadvice.org.uk/family/living-together-marriage-and-civil-partnership/getting-married/Anyway - now that I've clarified some of the varying legal aspects, since you keep mentioning "the law" perhaps you could now confirm whether or not you agree that where religious authorities or Humanist celebrants in any part of UK decline to marry same-sex couples then they are exhibiting personal and/or organisational homophobia.