I agree. Biden, like all of us, has faults. Politicians are no different than the rest of us. Let me rephrase my previous statement to be more concise. Biden, like every President except Lincoln, identifies as Christian and he attends Mass regularly. As, you note, that doesn't necessarily mean that he is actually living a life that is bearing the fruit of the spirit.
If by being a staunch supporter of homosexuality and transgenderism, you refer to the fact that he supports freedom and equality under the law of the United States for them, I don't see how you equate that with the statement that he is personally a "staunch supporter of homosexuality and transgenderism". Christ taught, "Judge not lest ye be judged". I don't know anymore about Mr. Biden's faith or convictions than what is reported in the public record. I wish we could have a President who actually ran the country according to purely Christian ideals. It's never happened to date and I doubt seriously it ever will. My personal political opinion is a paraphrase of a Will Rogers quote. I always want to vote for the person who is best suited for the job. That person has yet to run.
All that aside, I still can't fathom the jump from the fact that you think he supports homosexuality (and transgenderism) to the statement that he (or those in his administration) hates Christianity. That's a big part of the reason I believe that Christians should refrain from engaging in the hyper-partisan politics that are so prevalent today. It almost invariably leads to inflammatory rhetoric, judgement and ill feelings over things that Christ never told us to concern ourselves with. The late Rev. Billy Graham, who was well known for his involvement with politicians, Presidents and partisan politics, spoke of the issue on several occasions . In a 1981 interview with Parade Magazine, he stated "It would disturb me if there was a wedding between religious fundamentalists and the political right. The hard right has no interest In religion except to manipulate it." When asked in a 2011 interview with Christianity Today if there was anything he would have done differently in his life, he answered that he "would have steered clear of politics.". Christ said, "Render therefore unto Caesar the things which are Caesar's; and unto God the things that are God's." and He set the example by the fact that He never said another word about politics.
That said, Christ not only told us what not to do, He told us what to do and I believe that if Christians spent more of their time and resources doing what He did tell us to do and less on those things that He didn't, the world would be a much better place. As I heard an old Baptist preacher say once, "The Bible is full of things God told us not to do. It's also full of the things He told us to do. If every Christian spent their time doing the things He told us to do, we wouldn't even have time for those things He told us not to do."