Why do Catholics make the sign of the cross before entering into the church?

Can I make the sign of the cross and bless myself with holy water if I am not Catholic?
​Anyone can make the sign of the cross. Making the sign of the cross is a powerful prayer for enlightenment and protection. If you make it while saying, “In the name of the Father and of the Son and of the Holy Spirit, amen,” then you are combining an act of faith in Christ’s Cross and Passion with the profession of faith in the Holy Trinity, and this will be very good for your soul.
The water in the fonts at the entrance of the church is blessed by a priest to be holy. When a person makes the Sign of the Cross on themselves with holy water while saying the above, they remind themselves and call upon the grace of their Baptism preparing themselves in reverence to worship God. In Baptism water is poured out on the person three times in the name of the Father and the Son, and the Holy Spirit. While making the sign of the cross, Catholics do three things; thank God, remind themselves of their dignity as God’s children, and bring to mind that they are members of God’s family, the Body of Christ. If you are not baptized it can be a profession that it is your desire to be baptized. This is a way Catholics prepare themselves to enter into the holy mass, leaving the worldly things behind and entering into a holy place prepared to meet Jesus in the Eucharist. There is also an old tradition that Catholics shake their hand with the holy water toward the floor before making the cross, this tradition was a sign of their prayer for souls in purgatory each time they entered the church. 

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