Romans 10:9 That if you confess with your mouth, “Jesus is Lord,” and believe in your heart that God raised him from the dead, you will be saved. 10For it is with your heart that you believe and are justified, and it is with your mouth that you confess and are saved. 11As the Scripture says, “Anyone who trusts in him will never be put to shame.”[e] 12For there is no difference between Jew and Gentile—the same Lord is Lord of all and richly blesses all who call on him, 13for, “Everyone who calls on the name of the Lord will be saved.”
There is nothing that requires membership in any particular church or that there is no salvation outside any particular church.