Podiatrist Steve Hardie, who worked for Peterborough Community Services, has appeared before a Health Professions Council fitness to practise hearing.
He is also accused of "rude" behaviour towards two male patients he believed to be a gay couple.
Mr Hardie denies misconduct and denies his fitness to practise was impaired.
The hearing was told Mr Hardie treated a high-risk diabetic patient who had an ulcer on his foot in May 2005.
But he failed to give him a full assessment and gave him a follow-up appointment that was too far in the future to be "in keeping with usual practice", the hearing was told.
Mr Hardie later explained his actions to his line manager, Joanna Hood, by saying the patient was an "effeminate man", the tribunal at the Health Professions Council in London was told.
Vicky Lord, representing the council, said: "Miss Hood was aware he didn't approve of homosexuality. He had quoted his Christian faith as a reason for his views."
Mr Hardie is also accused of walking out of a child protection training session in June 2006 because he believed the trainer had "made passes" at him, including an incident in which the man smiled at him with "eyes twinkling".
In a further incident, Mr Hardie has admitted refusing to go into a clinic in February 2007 with a work colleague because of the man's sexual orientation.
On another occasion, in June 2009, Hardie asked a colleague to swap a patient, known as Patient D, who was HIV positive.
When challenged, he said that "everyone's beliefs were respected except his, and that Patient D's lifestyle was not in keeping with his beliefs because Patient D was 'you know'," Miss Lord said.
"He thought that because he was HIV positive he was also gay."
In a further allegation of misconduct, Hardie is said to have refused to declare to the trust that he was also undertaking private podiatry work in Peterborough.

Grace, 31, had an amazing run to the semi-finals last year but 19-year-old Zhao, one of the rising stars of the game, showed superb form to beat him.
The Leeds player said he felt the need to go for hard pots because Zhao was "potting balls off the lampshade".
"I had half-chances but I couldn't take them," Grace said.
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"Up until a few weeks ago I was winning lots of first-round games. But I have had Mark Williams in the last tournament [Northern Ireland Open] and Zhao Xintong here.
"It's a tough draw so I will not beat myself up too much.
"It would have been to get through to at least the televised stages because I really enjoyed it last year. But it wasn't to be."
Grace, the world number 47, said he felt his form was decent and remained positive about his chances in the German Masters qualifiers and Scottish Open, which are both before Christmas.
"I don't feel like I am that far away - just a few missed shots here and there and key moments in the game," he added.
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Countryman Gary Hunt, 32, retained the Best High Diver of the Year award after a second successive World Cup success.
Hungary's Katinka Hosszu, 27, who won three Olympic golds, was Best Female Swimmer for a third year in a row.
American Michael Phelps, 31, who retired after Rio with a record 23 Olympic golds, won the men's award.
Phelps' 19-year-old compatriot Katie Ledecky, who won four gold medals in Brazil, took the female Olympic performance award from swimming's world governing body.
Peaty, 21, clocked 57.13 seconds to win gold by more than 1.5 seconds and become Britain's first male Olympic swimming champion for 28 years.
A Christian health worker asked a colleague to treat one of his patients because he believed the man was homosexual, a hearing has been told.
[NEXT_CONCEPT]
David Grace was unable to repeat his 2015 UK Championship heroics but said he did little wrong in his 6-2 first-round defeat by China's Zhao Xintong.
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Britain's Adam Peaty won Fina's Olympic Performance of the Year award for his world record-breaking 100m breaststroke final win at Rio 2016.