The idea that there needs to be another physical temple and sacrifices of red heifers is not supported by the Bible. It is contrary to it. 

Here’s the important part of how the sacrifice of the red heifer points to Jesus: It is the only sacrifice that took place “outside the camp” (Num. 19:3, 9). Like the red heifer, Jesus was slain “outside the gate” (Heb. 13:12), that is, “outside the camp” (13:13).

Given the fact that Jesus is the fulfillment of all the sacrifices required under the Old Covenant, there is no need for a red heifer sacrifice today. For any Christian to suggest that there is significance to a red heifer today is to deny the “it is finished” (John 19:30) sacrifice of Jesus and the purpose of the book of Hebrews. Jews who want to revive the red heifer ordinance are no different from Jews who rejected Jesus as the once-for-all sacrifice fulfillment of all the types under the Old Covenant.

What about the argument that the red heifer sacrifice is to be “a lasting ordinance both for the Israelites and for the aliens living among them” and “a perpetual statute”? (Num. 19:10, 21). It’s obvious that it hasn’t been for nearly 2000 years. That’s because the perpetuity of the red heifer sacrifice (like all the sacrifices) was fulfilled in Jesus, as the book of Hebrews states.

https://americanvision.org/posts/holy-cow-hermeneutics/