If marriage doesn't exist in heaven, what's the point of marriage here on earth? You're no longer going to stay married to your spouse once in heaven. Also what makes it holy if it only exists on earth and not in heaven? Is marriage something that ultimately has to be transcended to go all the way? My impression of Christianity coming from a Buddhist background is Christianity views marriage and sexuality more positively as long as its within marriage, and not something that ultimately has to be transcended.(except for tibetan buddhism, but thats a long explanation) In fact marriage is something sacred. Am I right there? Now of course Buddhism is a completely different religion because they teach reincarnation and no creator god. Also I don't know if Christianity has an equivalent to enlightenment. Please correct me if I'm wrong.
1st a comment regarding your "Christianity coming from a Buddhist background" assertion.
Christ is the begining & created Buddha.
Creator verses; Jn 1:3 & 10, Col 1:16 & 17, 1 Cor 8:6, Eph 3:9.
Here's reference a link with dozen's of bible versions, just a click away.
BibleGateway.com: A searchable online Bible in over 150 versions and 50 languages.
As to marrying or giving in marriage according to scripture.
There is & will be, NO, marrying or giving in marriage traditions in the heavenlies.
There is one heavenly wedding/marriage forthcoming. It's a One Time Everlasting Event! When the LORD marries His redeemed. Where the Lord will have that promised cup (Matt 26:29 & Lk 22:18) of a blessing with His redeemed bride.
Rev 7:7 Let us be glad and rejoice, and give honour to him: for the marriage of the Lamb is come, and his wife hath made herself ready.
Rev 19:9 And he saith unto me, Write, Blessed are they which are called unto the marriage supper of the Lamb. And he saith unto me, These are the true sayings of God.
OT: Lord is husband reference:
Isa 54:5 For thy Maker is thine husband; the LORD of hosts is his name; and thy Redeemer the Holy One of Israel; The God of the whole earth shall he be called.
Jer 31:32 Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the LORD.
Many Jews believe the 10 commandments, given on Mt Sinai, on the 1st recorded Pentecost. Were a covenant/marriage contract & the Lord was there husband.
I believe the Lord Jesus entered into covenant/marriage contract. And betrothed His bride, the redeemed Body of Christ. At the 1st post resurrection Pentecost. And Christ's indwelling Holy Spirit is the contract Seal.