I'm sorry to hear this.
Just a quick question first - do you have any limits in NSW when you can acquire and dispose of your animals? (Here in Vic once we buy we can't sell or dispose of for at least 6 months). I'd check that out first because you wouldn't want to do anything illegal by selling it or giving it away too soon.
But apart from that in regards to convincing your parents I fear you've gone about it the wrong way, but there may still be some hope. I know the saying that it's easier to ask for forgiveness than permission - but in reality I think trust plays a bigger part.
Your parents are misguided - but they most likely have your best interest at heart - even though it's from misinformation and fear of the unknown.
Don't let your passion for a snake drive a wedge between you and your parents. Your relationship with them is far more important than any pet. (I'll probably get blasted for saying that from some people - but I sincerely believe it). More so - allowing this to drive a wedge or get you offside with each other will only prove your visitors statements that snakes are evil..... because they will see this as snakes being the cause of this problem.
Try to be the bigger of the two parties - and try to make allowances for your parents weakness in this. Your original post comes across as you being very mature about this anyway - so I'll give it to you straight if that's OK.
Doing your best to be patient, and understanding their concerns will go a long way. (Notice I said
understand their concerns... this doesn't mean you need to
agree with them - but to get a genuine and deeper understanding of why they think the way they do). It's probably not the snake - it'll be something deeper that they're concerned about. Do they really think snakes are 'Spiritually Evil'. Or are they concerned about it attacking you? Or do they have fear themselves of it escaping?
Really take time to listen to them - and not just on one occasion. Don't just give them time to talk but really show that you're taking in their concerns and want to understand deeper - that you take an interest in what they think and that you're not just going to dismiss their 'wisdom'.
Show them that if they have a genuine concern - you want to get an understanding of what it is - incase you are missing something. That you want to learn from them.
And be genuine too - you may learn something yourself. But if it's genuine maybe understanding their viewpoint and fears it will help you to see some opportunities for dealing with those fears in a way they will understand.
Or - you may have a chance of saying "OK - I get where you're coming from. I think I understand your side. Would you oblige me to do the same with me and take the time to understand mine as well". But not straight away. It cant be like a "I gave you time, now you give me time", or they'll just listen to save face without wanting to understand.
Make this about you and your parents getting closer to each other and understanding eacah other instead of about who gets to get their own way - and it'll be easier (if it's possible) to win them over because you have the high ground on facts - but they have the high ground on authority. Conversely - make this about you and your parents getting further apart and arguing getting offside with each other and they'll only dig their heels in.
Your desire to understand them needs to be genuine, as well as unconditional - regardless of whether they give the same opportunity back. Show love.
If it is genuine, and they see this - it
may open up doors - but keep in mind that the level that they'll be willing to go to maybe limited by the level that you show them to start with - so be sincere about wanting to really understand all their concerns, and not only that - be compassionate and considerate about it.
Keep in mind that while
their actions may be misguided - their fear or concern is real. (Regardless of how badly conceived it is. A kid who's afraid of the boogey man still has real fear even though the boogey man isn't real).
With what I've said above - I'm not talking about manipulation. The goal here needs to be
genuine - to bring you closer together so that you can all get a better understanding of each others side - not to manipulate them.
Obviously there's no guarantee's - but I'm guessing the reason they're doing this is most likely out of their concern because they love you. As I said before - misguided - but never the less genuine love. And if that is the case - I think the best option you have is the softly-softly approach - to show love and understanding back and hope that there is some middle ground you may be able to meet on in the end.
That's just my own personal opinion - I'm sorry for the great wall of text. I hope it's encouraging and of some help.
[doublepost=1570697567,1570697157][/doublepost]PS - If they are willing after you do this - maybe sit down together and watch a few episodes of 'Snake Discovery' on youtube. (Pre-select them first
). Emma on that channel has a brilliant way of relating to people and bringing across factual information about snakes whilst being entertaining and putting them in a good light.