Christians, why don't we all make the sign of the cross

Because sign of the cross is not mentioned any in the pages of the bible. Cross is a sign of punishment which Jesus Christ won, it is a symbol of sacrifice for us.. Signing the cross is from Vatican ordinances... see you around

I think it's just plainly a Roman Catholic ritual. Jesus taught us how to pray in the book of Matthew and he didn't make the sign of the cross...it doesn't mean anything to do that anyway, I believe.

There are some other denominations where the sign of the cross is used but many denominations see using symbols (which is what the sign of the cross is) as coming close to idolatry - worshipping things that represent God rather than worshipping God Himself - so they try to avoid all such things. There are also many denominations, of course, who reject Catholicism (that, after all, is why there are so many different denominations in the first place) and see making the sign of the cross as something that Catholics do (so they should not).

I agree with Visavis. Signing of the cross as what other people are doing is not in the Bible. Signing of the cross were people did to crucify Jesus. There were a big crowd at that time. People afar use sign language as " signing of the cross" for them to be heard. For me, signing of the cross is constantly crucifying Jesus.

The Greek Orthodox followers also make this sign, but to some, they might not be considered Christians. They look more like Jews to me.