How do the different sects (denominations?) of Christians recognize other Christians
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You pray to Heavenly Father and ask Him in the Name of Jesus Christ!
You ask if they believe that there is one God and He is an everlasting God and that He sent His only son Jesus to earth to die for our sins and by His grace alone you are saved if you ask Him to be your Savior and forgive your sins.
“How do the different sects (denominations?) of Christians recognize other Christians
You pray to Heavenly Father and ask Him in the Name of Jesus Christ!”
Christians read from the same bible. How you interpret, or not interpret, or how your priest-boss interprets it, is a different matter.