Read: Ezekiel 43-45
Marked: Ezekiel 44:9, Thus says the Lord GOD: “No foreigner, uncircumcised in heart or uncircumcised in flesh, shall enter My sanctuary, including any foreigner who is among the children of Israel.
This is a pretty clear statement that not just anyone can participate in worship of God. Those who are uncircumcised in heart and flesh have no covenant with God. Their place is outside the sanctuary.
Heaven is reserved for those of the covenant of God as stated by God. No one can come to God except through Jesus. Those outside the covenant remain in darkness.