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When someone gives you their account email and password, you will have full access to their account and can transfer funds to that account using other methods. So why would anyone give you access to their account with their funds?
Well I assume you are an honest person. And I also accept your condition that you will gamble using my funds and account and i should pay you 50% of my total profit. But if you lose my funds while gambling then who will take the responsibility of that money? Will you take responsibility for 50% of that lost money? As you are ready to take 50% dividend ?
A newbie promising that is no different than a scammer requesting for your private seed phrases so he could donate to your account.
I have a bet365 account but I definitely wouldn't trust a newbie. And not just a newbie, I will never give anyone my personal email and password. Because a personal password always carries a person's security . And a personal password can guess the type of other passwords a person uses and a hacker can go a long way in his hacking career by relying on that password.
For us to get rid of scammers, we are always advised not to give or entrust our personal details to someone online. Despite the good offer that you're saying, I don't think it's appropriate to ask for someone's personal information just to pursue your plan. If you're sincere with your offer, you better find a decent way to make it realistic.