Of coursel. All kindss of sex between two consenting adults are accepted in Satanism. Just don't make gay your entire identity, as it's unhealthy. It's like basing your entire identity on your eye color or the clothes you wear. What to do in your bedroom is just an insignificant personal thing comparable to your eye color or what clothes you wear, nothing more.
It's not "normal", it's just not immoral.
It's not part of normality, but that doesn't mean it can't be practiced.
Not least because you can't misjudge a person by their attractiveness.
Yes, Satanists can be both gay and bisexual, there are no restrictions on this.
In my country, people of non-traditional sexual orientations (a legal term in my country) are persecuted , so many gays and bisexuals hide their sexual orientation even from their wives, while meeting men in secret, also in my country gays and lesbians enter into fictitious marriages and register their marriages so that their relatives and friends do not know that they are gay and lesbian.
In my country, gays and bisexuals are also treated very badly, and women themselves, some people may be mistaken for gays by very conservative women, also in my country, many conservative women despise gentle men who have a traditional orientation, and some girls laugh at them and consider them not very masculine, although all people have different harkters and temperaments, and they have nothing to do with sexual orientation.