Outside of Jerusalem, on Sabbath day, the Israelites gather in synagogues. Synagogues are not temples because there is only one Temple which must be located in Jerusalem. Likewise, outside of Israel, because of the Greek language, Christians go to churches in the English language. It is the same idea of a place of gathering of believers in God outside of the Temple.
Luke 4:14-15 EMTV
(14) Then Jesus returned in the power of the Spirit to Galilee, and news about Him went out through all the surrounding region.
(15) And He taught in their synagogues, being glorified by all.
We prefer 'synagogues' to remind the believers that, before the advent of Jesus in Judaism, the Gentiles joined the Israelites in their synagogues to worship the God of Israel. With the advent of Jesus, Christianity is in fact Judaism because the founders of the Faith were Israelites who also worshiped in synagogues, including Jesus.
Acts 11:26 Darby
(26) And having found him , he brought him to Antioch. And so it was with them that for a whole year they were gathered together in the assembly and taught a large crowd: and the disciples were first called Christians in Antioch.
They just happened to be called Christians because they believe in the Gospel of the Judaism of John the Baptist and Jesus. In fact, when you read the phrase 'they were gathered together' in the translation, the Greek language actually says that 'they were synagogued'.
Christianity has been hijacked by many, even if their core doctrines are condemned by Moses.
We adopt the word 'Christianous' to more closely identify with ancient everlasting apostolic Judaism than modern Christians. We adopt the word 'Christianousness' with the same spirit. The words sound weird for now but they will catch on during the millenia to come.