How can a Christian person marry a Shinto or Buddhist person?

Well i was asking myself , that I'm very interested in Japanese girls because they are very honest and they are very beautiful girls that have a lot of good characteristics...And I'm christian, I'm very interested in finding a Japanese women, but like if a person in this case had like years being together with a Japanese female and decided to marry how would they marry each other? Would they had to have like a double marriage like one in Christan and another in Shinto style? how would they marry?
also I'm asking this question because my uncle wants to marry her Japanese Gf.

by whatever way they choose

Shintoism is the belief of spirits in everything, so I could see them getting married.
And Japanese are beautiful

If a Christian wants to marry a person from another religion usually the ceremony is conducted in the other persons religion e.g. Buddhist, and overseen by a priest/minister so that the marriage is valid in both faiths

I am Japanese with a Shinto upbringing. There is no problem for the Japanese, it's the Christian I worry about (depending on how "fun die" they are).

It's really up to the couple how they want to do it. There is no "right" way. Many Shintoists also practice Buddhism or Christianity. Shinto deals with life in harmony with nature and society, and the other religion deals with death.