Do you Believe in the Trinity of Father, Son & the Holy Spirit

I believe in the Trinity of Father, Son and the Holy Spirit. I believe every Christian who proclaim that they follow Jesus believe in Trinity. About the cost of following Jesus Christ, we might not knowing what is the cost. Maybe in some closed minded country, the cost will be our life. But in some other country, the cost maybe is our time and energy as we need to go out there and reached more people to share to them about Jesus Christ.