No. It merely means someone is born either male and feels female or is born female and feels male. God would love anyone who does not hurt anyone else and tries to help others.
Yes they can. Being transgender is a matter of identity, and not of skill - there is nothing to stop a transgender person from being as successful in acting as any other person.
no
They don't choose to be transgender, they just are. It's not a choice
Become a man.
Being transgender isn't something someone wants, it is something you are - just like being cisgender. Your body is that of your sex or gender, you don't have to go through hormone treatment or surgery when you are transgender - transgender means your gender is not that which was assigned at birth.
Being transgender wont make him any different that way. He's a 8yo with toys I imagine so the worst thing depends on the child, not whether he is transgender or not.
No. Transgender is neither a disease nor a physical condition. There is a diagnosis that might be applied called "Gender Identity Disorder" or GID. Generally those with GID are persons awaiting Gender Reassignment Surgery. Neither is being transgendered a sin or even "wrong"; a person's self-perception (including sexual/gender identity) is never what we see, it is deeper than flesh and bone.
It's not a sin anymore
Is it a huge sin to stop being a nun? Of the Roman Catholic Church? No. It is not a sin at all.
Transgender women are real in terms of them existing. If one is asking about whether they are genuine women or not is up to personal interpretation. Some would consider them as being on par with non-transgender (cisgender) women, while others would consider them valid members of their own separate gender. Then of course there are people who do not think positively about transgender women.
Wouldn't that technically defeat the purpose of being a lesbian?
No. Being a lesbian is not a sin, nor is thinking about being a lesbian (or lesbians in general).