

It is not true that we may not say the name of God with our mouth because of the declarations in Joel 2:32, Romans 10:9-13, Philippians 2:11.
Exodus 20:7 ASV
(7) Thou shalt not take the name of Jehovah thy God in vain; for Jehovah will not hold him guiltless that taketh his name in vain.
Exodus 20:7 KJV
(7) Thou shalt not take the name of the LORD thy God in vain; for the LORD will not hold him guiltless that taketh his name in vain.
Deuteronomy 6:4 ASV
(4) Hear, O Israel: Jehovah our God is one Jehovah:
Deuteronomy 6:4 KJV
(4) Hear, O Israel: The LORD our God is one LORD:
Mark 12:29 KJV
(29) And Jesus answered him, The first of all the commandments is, Hear, O Israel; The Lord our God is one Lord:
Mark 12:29 ASV
(29) Jesus answered, The first is, Hear, O Israel; The Lord our God, the Lord is one:
Joel 2:32 KJV
(32) And it shall come to pass, that whosoever shall call on the name of the LORD shall be delivered: for in mount Zion and in Jerusalem shall be deliverance, as the LORD hath said, and in the remnant whom the LORD shall call.
Joel 2:32 ASV
(32) And it shall come to pass, that whosoever shall call on the name of Jehovah shall be delivered; for in mount Zion and in Jerusalem there shall be those that escape, as Jehovah hath said, and among the remnant those whom Jehovah doth call.