SHE WILL ACCEPT ISLAM IF I MARRY HER:
Praise be to Allah:
There is no such concept of LBW(love before wedding) In Islam !!
Now you want to marry her but She is Budhist?
Do not marry unbelieving women (idolaters), until they believe: A slave woman who believes is better than an unbelieving woman, even though she allures you. Nor marry (your girls) to unbelievers until they believe: A man slave who believes is better than an unbeliever, even though he allures you. Unbelievers do (but) beckon you to the Fire. But Allah beckons by His Grace to the Garden (of bliss) and forgiveness, and makes His Signs clear to mankind: That they may celebrate His praise.
[Al-Qur'an ch 2 Verse 221]
Its very clear that marrying unbeliever is Harram in Islam , prohibited in Islam . Its a Major Sin .
Brother your Job to convey the Message of Allah , Guidance in the Hands of Allah .
Allah says in the Qur'an ch 88 Veres 21 "you are just reminder to remind them"
your job to convey the Message of Allah , Whether She or He accept or not you are not responsible for that, you will not be Questioned on the day of Judgement.
Allah says in the Qur'an ch 2 Verse 272 "It not unto you of their guidance but unto Me(Allah)"
Marring just because of She will Accept Islam, If you want to marry most welcome but Accepting Islam just because of marriage purpose, then its useless . If she want to accept Islam with whole hearty , as Islam is the best and true religion , that Allah is one and Mohammed(pbuh) is the final messenger of Allah , If she accept it with complete submission to Allah then fine but for the formality to only marry , then don't marry . If she really love Islam she should accept Islam even you don't marry her. If she put the condition that if you marry then only she accept Islam ! Brother don't marry her , she accepting Islam(Actually not accepting just showing) because for you , not for Allah !!. You will face not of problem in Future if you marry her !. Or tell her I will see you for few months 6 or 8 whether you practicing Islam or not, if you doing whole hearty then I will marry.
If you don't marry she will die as Non Muslim ?
You can't help her really, prophet Mohammed(pbuh) can't help his Uncle. your job to convey the message of Allah and helping her in practice fine but if She don't want to accept Islam , you can't force her .
Allah says in the Qur'an ch 2 Verse 257 "There is no compulsion in Religion(In Deen)"
if i marry her then she is too old for me?
If the Girl and the Boy are Muslim if they want to marry irrespective age differences, no problem , prophet Mohammed(pbuh) at the age of 25 first married Bibi Kahija(R.A) she was 15 year elder and two time widow.
Allah knows the best
Answered By Mohammed Asif Ali.