I see no particular religion being holy no matter what denomination it calls itself. It's not about a man's religion, but all about having a personal relationship with Christ by that of the grace of God.
1 Samuel 2:1 And Hannah prayed, and said, My heart rejoiceth in the LORD, mine horn is exalted in the LORD: my mouth is enlarged over mine enemies; because I rejoice in thy salvation. 2 There is none holy as the LORD: for there is none beside thee: neither is there any rock like our God.
Matthew 23:8 But be not ye called Rabbi: for one is your Master, even Christ; and all ye are brethren. 9 And call no man your father upon the earth: for one is your Father, which is in heaven. 10 Neither be ye called masters: for one is your Master, even Christ. 11 But he that is greatest among you shall be your servant. 12 And whosoever shall exalt himself shall be abased; and he that shall humble himself shall be exalted.